Octopus
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This article is about the order of cephalopod. For other uses, see Octopus (disambiguation).
Octopus
Temporal range: 323.2 – 0 Ma
PreЄ
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S
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C
P
T
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Late Carboniferous – recent
Common octopus
(Octopus vulgaris)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Coleoidea
(unranked): Neocoleoidea
Superorder: Octopodiformes
Order: Octopoda
Leach, 1818[1]
Suborders
Cirrina
Incirrina
Synonyms
Octopoida
Leach, 1817[2]
The octopus (/ˈɒktəpəs/ or ~/pʊs/) is a soft-bodied, eight-armed mollusc of the order Octopoda. Around 300 species are recognised and the order is grouped within the class Cephalopoda with squids, cuttlefish and nautiloids. Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the centre point of the arms (which are sometimes mistakenly called "tentacles"). The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight arms behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.
Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow fast, mature early and are short-lived. During breeding, the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes senescent and dies. The female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies.
Strategies to defend themselves against predators include the expulsion of ink, the use of camouflage and threat displays, their ability to jet quickly through the water, and their ability to hide. All octopuses are venomous, but only the blue-ringed octopuses are known to be deadly to humans.
Octopuses appear in mythology as sea monsters like the Kraken of Norway and the Akkorokamui of the Ainu, and probably the Gorgon of ancient Greece. A battle with an octopus appears in Victor Hugo's book Toilers of the Sea, inspiring other works such as Ian Fleming's Octopussy. Octopuses appear in Japanese erotic art, shunga. They are eaten by humans in many parts of the world, especially the Mediterranean and the Asian seas.
Contents
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1 Etymology and pluralisation
2 Anatomy and physiology
2.1 Size
2.2 External characteristics
2.3 Circulatory system
2.4 Respiration
2.5 Digestion and excretion
2.6 Nervous system and senses
2.7 Ink sac
3 Lifecycle
3.1 Reproduction
3.2 Lifespan
4 Distribution and habitat
5 Behaviour and ecology
5.1 Feeding
5.2 Locomotion
5.3 Intelligence
5.4 Camouflage and colour change
5.5 Defence
5.6 Pathogens and parasites
6 Evolution
6.1 Fossil history and phylogeny
6.2 Taxonomy
6.3 RNA editing
7 Relationship to humans
7.1 Cultural references
7.2 Danger
7.3 Fisheries and cuisine
7.4 In science and technology
8 References
8.1 Sources
9 External links
Etymology and pluralisation
The scientific Latin term octopus was derived from Ancient Greek ὀκτώπους or ὀκτά-, a compound form of ὀκτώ (oktō, "eight") and πούς (pous, "foot"), used for example by Alexander of Tralles (c. 525-c. 605) for the common octopus.[3][4][5][6] The standard pluralised form of "octopus" in English is "octopuses" /ˈɒktəpəsɪz/;[7] the Ancient Greek plural ὀκτώποδες, "octopodes" /ɒkˈtɒpədiːz/, has also been used historically.[8] The alternative plural "octopi" – which misguidedly assumes it is a Latin "-us"-word – is considered grammatically incorrect,[9][10][11][12] but is used frequently enough to be acknowledged by the descriptivist Merriam-Webster 11th Collegiate Dictionary and Webster's New World College Dictionary. The Oxford English Dictionary lists "octopuses", "octopi", and "octopodes", in that order, calling "octopodes" rare and noting that "octopi" is based on a misunderstanding.[13] New Oxford American Dictionary (3rd Edition 2010) lists "octopuses" as the only acceptable pluralisation, and indicates that "octopodes" is still occasionally used, but that "octopi" is incorrect.[14]
Anatomy and physiology
Size
See also: Cephalopod size
Giant Pacific octopus at Echizen Matsushima Aquarium, Japan. It is considered to be the largest species.
The giant Pacific octopus (Enteroctopus dofleini) is often cited as the largest known octopus species. Adults usually weigh around 15 kg (33 lb), with an arm span of up to 4.3 m (14 ft).[15] The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (156.5 lb).[16] Much larger sizes have been claimed for the giant Pacific octopus:[17] one specimen was recorded as 272 kg (600 lb) with an arm span of 9 m (30 ft).[18] A carcass of the seven-arm octopus, Haliphron atlanticus, weighed 61 kg (134 lb) and was estimated to have had a live mass of 75 kg (165 lb).[19][20] The smallest species is Octopus wolfi, which is around 2.5 cm (1 in) and weighs less than 1 g (0.035 oz).[21]
External characteristics
The octopus is bilaterally symmetrical along its dorso-ventral axis; the head and foot are at one end of an elongated body and function as the anterior (front) of the animal. The head includes the mouth and brain. The foot has evolved into a set of flexible, prehensile appendages, known as arms, that surround the mouth and are attached to each other near their base by a webbed structure.[22] The arms can be described based on side and sequence position (such as L1, R1, L2, R2) and divided into four pairs.[23][22] The bulbous and hollow mantle is fused to the back of the head and is known as the visceral hump; it contains most of the vital organs.[24][25] The mantle cavity has muscular walls and contains the gills; it is connected to the exterior by a funnel or siphon.[22][26] The mouth of an octopus, located underneath the arms, has a sharp hard beak.[25]
Diagram of octopus from side, with gills, funnel, eye, ocellus (eyespot), web, arms, suckers, hectocotylus and ligula labeled.
The skin consists of a thin outer epidermis with mucous cells and sensory cells, and a connective tissue dermis consisting largely of collagen fibres and various cells allowing colour change.[22] Most of the body is made of soft tissue allowing it to lengthen, contract, and contort itself. The octopus can squeeze through tiny gaps; even the larger species can pass through an opening close to 2.5 cm (1 in) in diameter.[25] Lacking skeletal support, the arms work as muscular hydrostats and contain longitudinal, transverse and circular muscles around a central axial nerve. They can extend and contract, twist to left or right, bend at any place in any direction or be held rigid.[27][28]
The interior surfaces of the arms are covered with circular, adhesive suckers. The suckers allow the octopus to anchor itself or to manipulate objects. Each sucker is usually circular and bowl-like and has two distinct parts: an outer shallow cavity called an infundibulum and a central hollow cavity called an acetabulum, both of which are thick muscles covered in a protective chitinous cuticle. When a sucker attaches to a surface, the orifice between the two structures is sealed. The infundibulum provides adhesion while the acetabulum remains free, and muscle contractions allow for attachment and detachment.[29][30]
A finned Grimpoteuthis octopus of the suborder Cirrina with its atypical octopus body plan.
The eyes of the octopus are large and are at the top of the head. They are similar in structure to those of a fish and are enclosed in a cartilaginous capsule fused to the cranium. The cornea is formed from a translucent epidermal layer and the slit-shaped pupil forms a hole in the iris and lies just behind. The lens is suspended behind the pupil and photoreceptive retinal cells cover the back of the eye. The pupil can be adjusted in size and a retinal pigment screens incident light in bright conditions.[22]
Some species differ in form from the typical octopus body shape. Members of the suborder Cirrina have stout gelatinous bodies with webbing that reaches near the tip of their arms, and two large fins above the eyes, supported by an internal shell. Fleshy papillae or cirri are found along the bottom of the arms, and the eyes are more developed.[31][32]
Circulatory system
Octopuses have a closed circulatory system, where the blood remains inside blood vessels. Octopuses have three hearts; a systemic heart that circulates blood round the body and two branchial hearts that pump it through each of the two gills. The systemic heart is inactive when the animal is swimming and thus it tires quickly and prefers to crawl.[33][34] Octopus blood contains the copper-rich protein haemocyanin to transport oxygen. This makes the blood very viscous and it requires considerable pressure to pump it round the body; octopuses' blood pressures can exceed 75 mmHg.[33][34][35] In cold conditions with low oxygen levels, haemocyanin transports oxygen more efficiently than haemoglobin. The haemocyanin is dissolved in the plasma instead of being carried within blood cells, and gives the blood a bluish colour.[33][34]
The systemic heart has muscular contractile walls and consists of a single ventricle and two atria, one for each side of the body. The blood vessels consist of arteries, capillaries and veins and are lined with a cellular endothelium which is quite unlike that of most other invertebrates. The blood circulates through the aorta and capillary system, to the vena cavae, after which the blood is pumped through the gills by the auxiliary hearts and back to the main heart. Much of the venous system is contractile, which helps circulate the blood.[22]
Respiration
Octopus with open siphon. The siphon is used for respiration, waste disposal and discharging ink.
Respiration involves drawing water into the mantle cavity through an aperture, passing it through the gills, and expelling it through the siphon. The ingress of water is achieved by contraction of radial muscles in the mantle wall, and flapper valves shut when strong circular muscles force the water out through the siphon.[36] Extensive connective tissue lattices support the respiratory muscles and allow them to expand the respiratory chamber.[37] The lamella structure of the gills allows for a high oxygen uptake; up to 65% in water at 20⁰C.[38] Water flow over the gills correlates with locomotion, and an octopus can propel its body when it expels water out of its siphon.[37][35]
The thin skin of the octopus absorbs additional oxygen.[39] When resting, around 41% of an octopus's oxygen absorption is through the skin. This decreases to 33% when it swims, as more water flows over the gills; skin oxygen uptake also increases. When it is resting after a meal, absorption through the skin can drop to 3% of its total oxygen uptake.[39]
Digestion and excretion
The digestive system of the octopus begins with the buccal mass which consists of the mouth, pharynx, radula and salivary glands.[40] The radula is a spiked, tongue-like organ made of chitin.[25] Food is broken down and is forced into the oesophagus by two lateral extensions of the esophageal side walls in addition to the radula. From there it is transferred to the gastrointestinal tract, which is mostly suspended from the roof of the mantle cavity by numerous membranes. The tract consists of a crop, where the food is stored; a stomach, where food is ground down; a caecum where the now sludgy food is sorted into fluids and particles and which plays an important role in absorption; the digestive gland, where liver cells break down and absorb the fluid and become "brown bodies"; and the intestine, where the accumulated waste is turned into faecal ropes by secretions and blown out of the funnel via the rectum.[40][41]
During osmoregulation, fluid is added to the pericardia of the branchial hearts. The octopus has two nephridia (equivalent to vertebrate kidneys) which are associated with the branchial hearts; these and their associated ducts connect the pericardial cavities with the mantle cavity. Before reaching the branchial heart, each branch of the vena cava expands to form renal appendages which are in direct contact with the thin-walled nephridium. The urine is first formed in the pericardial cavity, and is modified by excretion, chiefly of ammonia, and selective absorption from the renal appendages, as it is passed along the associated duct and through the nephridiopore into the mantle cavity.[22][42]
Play media
A common octopus (Octopus vulgaris) moving around. Its nervous system allows the arms to move with some autonomy.
Nervous system and senses
The octopus (along with cuttlefish) has the highest brain-to-body mass ratios of all invertebrates, and is also greater than many vertebrates.[43] It has a highly complex nervous system, only part of which is localised in its brain, which is contained in a cartilaginous capsule.[44] Two-thirds of an octopus's neurons are found in the nerve cords of its arms, which show a variety of complex reflex actions that persist even when they have no input from the brain.[45] Unlike vertebrates, the complex motor skills of octopuses are not organised in their brain via an internal somatotopic map of its body, instead using a nonsomatotopic system unique to large-brained invertebrates.[46]
Eye of common octopus
Octopuses have keen eyesight. Like other cephalopods, they can distinguish the polarisation of light. Colour vision appears to vary from species to species, for example being present in O. aegina but absent in O. vulgaris.[47] Attached to the brain are two special organs called statocysts (sac-like structures containing a mineralised mass and sensitive hairs), that allow the octopus to sense the orientation of its body. They provide information on the position of the body relative to gravity and can detect angular acceleration. An autonomic response keeps the octopus's eyes oriented so that the pupil is always horizontal.[22] Octopuses may also use the statocyst to hear sound. The common octopus can hear sounds between 400 Hz and 1000 Hz, and hears best at 600 Hz.[48]
Octopuses also have an excellent sense of touch. The octopus's suction cups are equipped with chemoreceptors so the octopus can taste what it touches. Octopus arms do not become tangled or stuck to each other because the sensors recognise octopus skin and prevent self-attachment.[49]
The arms contain tension sensors so the octopus knows whether its arms are stretched out, but this is not sufficient for the brain to determine the position of the octopus's body or arms. As a result, the octopus does not possess stereognosis; that is, it does not form a mental image of the overall shape of the object it is handling. It can detect local texture variations, but cannot integrate the information into a larger picture. The neurological autonomy of the arms means the octopus has great difficulty learning about the detailed effects of its motions. It has a poor proprioceptive sense, and it knows what exact motions were made only by observing the arms visually.[50]
Ink sac
The ink sac of an octopus is located under the digestive gland. A gland attached to the sac produces the ink, and the sac stores it. The sac is close enough to the funnel for the octopus to shoot out the ink with a water jet. Before it leaves the funnel, the ink passes through glands which mix it with mucus, creating a thick, dark blob which allows the animal to escape from a predator.[51] The main pigment in the ink is melanin, which gives it its black colour.[52] Cirrate octopuses lack the ink sac.[31]
Lifecycle
Reproduction
Adult male Tremoctopus violaceus with hectocotylus
Octopuses are gonochoric and have a single, posteriorly-located gonad which is associated with the coelom. The testis in males and the ovary in females bulges into the gonocoel and the gametes are released here. The gonocoel is connected by the gonoduct to the mantle cavity, which it enters at the gonopore.[22] An optic gland creates hormones that cause the octopus to mature and age and stimulate gamete production. The gland may be triggered by environmental conditions such as temperature, light and nutrition, which thus control the timing of reproduction and lifespan.[53][54]
When octopuses reproduce, the male uses a specialised arm called a hectocotylus to transfer spermatophores (packets of sperm) from the terminal organ of the reproductive tract (the cephalopod "penis") into the female's mantle cavity.[55] The hectocotylus in benthic octopuses is usually the third right arm, which has a spoon-shaped depression and modified suckers near the tip. In most species, fertilisation occurs in the mantle cavity.[22]
The reproduction of octopuses has been studied in only a few species. One such species is the giant Pacific octopus, in which courtship is accompanied, especially in the male, by changes in skin texture and colour. The male may cling to the top or side of the female or position himself beside her. There is some speculation that he may first use his hectocotylus to remove any spermatophore or sperm already present in the female. He picks up a spermatophore from his spermatophoric sac with the hectocotylus, inserts it into the female's mantle cavity, and deposits it in the correct location for the species, which in the giant Pacific octopus is the opening of the oviduct. Two spermatophores are transferred in this way; these are about one metre (yard) long, and the empty ends may protrude from the female's mantle.[56] A complex hydraulic mechanism releases the sperm from the spermatophore, and it is stored internally by the female.[22]
Female giant Pacific octopus guarding strings of eggs
About forty days after mating, the female giant Pacific octopus attaches strings of small fertilised eggs (10,000 to 70,000 in total) to rocks in a crevice or under an overhang. Here she guards and cares for them for about five months (160 days) until they hatch.[56] In colder waters, such as those off of Alaska, it may take as much as 10 months for the eggs to completely develop.[57]:74 The female aerates the eggs and keeps them clean; if left untended, many eggs will not hatch.[58] She does not feed during this time and dies soon afterwards. Males become senescent and die a few weeks after mating.[59]
The eggs have large yolks; cleavage (division) is superficial and a germinal disc develops at the pole. During gastrulation, the margins of this grow down and surround the yolk, forming a yolk sac, which eventually forms part of the gut. The dorsal side of the disc grows upwards and forms the embryo, with a shell gland on its dorsal surface, gills, mantle and eyes. The arms and funnel develop as part of the foot on the ventral side of the disc. The arms later migrate upwards, coming to form a ring around the funnel and mouth. The yolk is gradually absorbed as the embryo develops.[22]
Octopus paralarva, a planktonic hatchling
Most young octopuses hatch as paralarvae and are planktonic for weeks to months, depending on the species and water temperature. They feed on copepods, arthropod larvae and other zooplankton, eventually settling on the ocean floor and developing directly into adults with no distinct metamorphoses that are present in other groups of mollusc larvae.[22] Octopus species that produce larger eggs – including the southern blue-ringed, Caribbean reef, California two-spot, Eledone moschata[60] and deep sea octopuses – do not have a paralarval stage, but hatch as benthic animals similar to the adults.[57]:74–75[61]
In the argonaut (paper nautilus), the female secretes a fine, fluted, papery shell in which the eggs are deposited and in which she also resides while floating in mid-ocean. In this she broods the young, and it also serves as a buoyancy aid allowing her to adjust her depth. The male argonaut is minute by comparison and has no shell.[62]
Lifespan
Octopuses have a relatively short life expectancy; some species live for as little as six months. The giant Pacific octopus, one of the two largest species of octopus, may live for as much as five years. Octopus lifespan is limited by reproduction: males can live for only a few months after mating, and females die shortly after their eggs hatch. Octopus reproductive organs mature due to the hormonal influence of the optic gland but result in the inactivation of their digestive glands, typically causing the octopus to eventually die from starvation.[63]:276–277 Experimental removal of both optic glands after spawning was found to result in the cessation of broodiness, the resumption of feeding, increased growth, and greatly extended lifespans.[64]
Distribution and habitat
Octopus cyanea in Kona, Hawaii
Octopuses live in every ocean, and different species have adapted to different marine habitats. As juveniles, common octopuses inhabit shallow tide pools. The Hawaiian day octopus (Octopus cyanea) lives on coral reefs; argonauts drift in pelagic waters. Abdopus aculeatus mostly lives in near-shore seagrass beds. Some species are adapted to the cold, ocean depths. The spoon-armed octopus (Bathypolypus arcticus) is found in abyssal plains at depths of 1,000 m (3,300 ft), and Vulcanoctopus hydrothermalis lives near hydrothermal vents at 2,000 m (6,600 ft).[24] The cirrate species are often free-swimming and live in deep-water habitats.[32] No species are known to live in fresh water.[65]
Behaviour and ecology
Most species are solitary when not mating,[66] though a few are known to occur in high densities and with frequent interactions, signaling, mate defending and eviction of individuals from dens. This is likely the result of abundant food supplies combined with limited den sites.[67] Octopuses hide in dens, which are typically crevices in rocky outcrops or other hard structures, though some species burrow into sand or mud. Octopuses are not territorial but generally remain in a home range; they may leave the area in search of food. They can use navigation skills to return to a den without having to retrace their outward route.[68] They are not known to be migratory.[69]
Octopuses bring captured prey back to the den where they can eat it safely. Sometimes the octopus catches more prey than it can eat, and the den is often surrounded by a midden of dead and uneaten food items. Other creatures, such as fish, crabs, molluscs and echinoderms, often share the den with the octopus, either because they have arrived as scavengers, or because they have survived capture.[70]
Feeding
Veined octopus eating a crab
Nearly all octopuses are predatory; bottom-dwelling octopuses eat mainly crustaceans, polychaete worms, and other molluscs such as whelks and clams; open-ocean octopuses eat mainly prawns, fish and other cephalopods.[71] Major items in the diet of the giant Pacific octopus include bivalve molluscs such as the cockle Clinocardium nuttallii, clams and scallops, and crustaceans such as crabs and spider crabs. Prey that it is likely to reject include moon snails, because they are too large, and limpets, rock scallops, chitons and abalone, because they are too securely fixed to the rock.[70]
A bottom-dwelling octopus typically moves among the rocks and feels through the crevices. The creature may make a jet-propelled pounce on prey and pull it towards the mouth with its arms, the suckers restraining it. Small prey may be completely trapped by the webbed structure. Octopuses usually inject crustaceans like crabs with a paralysing saliva then dismember them with their beaks.[71][72] Octopuses feed on shelled molluscs either by forcing the valves apart, or by drilling a hole in the shell to inject a nerve toxin.[73][72] It used to be thought that the hole was drilled by the radula, but it has now been shown that minute teeth at the tip of the salivary papilla are involved, and an enzyme in the toxic saliva is used to dissolve the calcium carbonate of the shell. It takes about three hours for O. vulgaris to create a 0.6 mm (0.024 in) hole. Once the shell is penetrated, the prey dies almost instantaneously, its muscles relax, and the soft tissues are easy for the octopus to remove. Crabs may also be treated in this way; tough-shelled species are more likely to be drilled, and soft-shelled crabs are torn apart.[74]
Some species have other modes of feeding. Grimpoteuthis has a reduced or non-existent radula and swallows prey whole.[31] In the deep-sea genus Stauroteuthis, some of the muscle cells that control the suckers in most species have been replaced with photophores which are believed to fool prey by directing them towards the mouth, making them one of the few bioluminescent octopuses.[75]
Locomotion
Octopuses swim with their arms trailing behind.
Octopuses mainly move about by relatively slow crawling, with some swimming in a head-first position. Jet propulsion, or backwards swimming, is their fastest means of locomotion, followed by swimming and crawling.[76] When in no hurry, they usually crawl on either solid or soft surfaces. Several arms are extended forwards, some of the suckers adhere to the substrate and the animal hauls itself forwards with its powerful arm muscles, while other arms may push rather than pull. As progress is made, other arms move ahead to repeat these actions and the original suckers detach. During crawling, the heart rate nearly doubles, and the animal requires ten or fifteen minutes to recover from relatively minor exercise.[27]
Most octopuses swim by expelling a jet of water from the mantle through the siphon into the sea. The physical principle behind this is that the force required to accelerate the water through the orifice produces a reaction that propels the octopus in the opposite direction.[77] The direction of travel depends on the orientation of the siphon. When swimming, the head is at the front and the siphon is pointed backwards, but when jetting, the visceral hump leads, the siphon points towards the head and the arms trail behind, with the animal presenting a fusiform appearance. In an alternative method of swimming, some species flatten themselves dorso-ventrally, and swim with the arms held out sideways, and this may provide lift and be faster than normal swimming. Jetting is used to escape from danger, but is physiologically inefficient, requiring a mantle pressure so high as to stop the heart from beating, resulting in a progressive oxygen deficit.[76]
Movements of the finned species Cirroteuthis muelleri
Cirrate octopuses cannot produce jet propulsion and rely on their fins for swimming. They have neutral buoyancy and drift through the water with the fins extended. They can also contract their arms and surrounding web to make sudden moves known as "take-offs". Another form of locomotion is "pumping", which involves symmetrical contractions of muscles in their webs producing peristaltic waves. This moves the body slowly.[31]
In 2005, Adopus aculeatus and veined octopus (Amphioctopus marginatus) were found to walk on two arms, while at the same time mimicking plant matter.[78] This form of locomotion allows these octopuses to move quickly away from a potential predator without being recognised.[76] A study of this behaviour led to the suggestion that the two rearmost appendages may be more accurately termed "legs" rather than "arms".[79] Some species of octopus can crawl out of the water briefly, which they may do between tide pools while hunting crustaceans or gastropods or to escape predators.[80][81] "Stilt walking" is used by the veined octopus when carrying stacked coconut shells. The octopus carries the shells underneath it with two arms, and progresses with an ungainly gait supported by its remaining arms held rigid.[82]
Intelligence
Main article: Cephalopod intelligence
Octopus opening a container by unscrewing its cap
Octopuses are highly intelligent, but the extent of their intelligence and learning capability are not well defined.[83][84][85][86] Maze and problem-solving experiments have shown evidence of a memory system that can store both short- and long-term memory. It is not known precisely what contribution learning makes to adult octopus behaviour. Young octopuses learn nothing from their parents, as adults provide no parental care beyond tending to their eggs until the young octopuses hatch.[57]:75
In laboratory experiments, octopuses can be readily trained to distinguish between different shapes and patterns. They have been reported to practise observational learning,[87] although the validity of these findings is contested.[83][84] Octopuses have also been observed in what has been described as play: repeatedly releasing bottles or toys into a circular current in their aquariums and then catching them.[88] Octopuses often break out of their aquariums and sometimes into others in search of food.[80][89][90] They have even boarded fishing boats and opened holds to eat crabs.[85] The veined octopus collects discarded coconut shells, then uses them to build a shelter, an example of tool use.[82][91][92]
Camouflage and colour change
Play media
Video of Octopus cyanea moving and changing its colour, shape and texture
Octopuses use camouflage when hunting, and to avoid predators. To do this they use specialised skin cells which change the appearance of the skin by adjusting its colour, opacity, or reflectivity. Chromatophores contain yellow, orange, red, brown, or black pigments; most species have three of these colours, while some have two or four. Other colour-changing cells are reflective iridophores and white leucophores.[93] This colour-changing ability is also used to communicate with or warn other octopuses.[94]
Octopuses can create distracting patterns with waves of dark coloration across the body, a display known as the "passing cloud". Muscles in the skin change the texture of the mantle to achieve greater camouflage. In some species, the mantle can take on the spiky appearance of algae; in others, skin anatomy is limited to relatively uniform shades of one colour with limited skin texture. Octopuses that are diurnal and live in shallow water have evolved more complex skin than their nocturnal and deep-sea counterparts.[94]
Defence
Warning display of greater blue-ringed octopus (Hapalochlaena lunulata)
Aside from humans, octopuses may be preyed on by fishes, seabirds, sea otters, pinnipeds, cetaceans, and other cephalopods.[95] Octopuses typically hide or disguise themselves by camouflage and mimicry; some have conspicuous warning coloration (aposematism) or deimatic behaviour.[94] An octopus may spend 40% of its time hidden away in its den. When the octopus is approached, it may extend an arm to investigate. 66% of Enteroctopus dolfleini in one study had scars, with 50% having amputated arms.[95] The blue rings of the highly venomous blue-ringed octopus are hidden in muscular skin folds which contract when the animal is threatened, exposing the iridescent warning.[96] The Atlantic white-spotted octopus (Callistoctopus macropus) turns bright brownish red with oval white spots all over in a high contrast display.[97] Displays are often reinforced by stretching out the animal's arms, fins or web to make it look as big and threatening as possible.[98]
Once they have been seen by a predator, they commonly try to escape but can also use distraction with an ink cloud ejected from the ink sac. The ink is thought to reduce the efficiency of olfactory organs, which would aid evasion from predators that employ smell for hunting, such as sharks. Ink clouds of some species might act as pseudomorphs, or decoys that the predator attacks instead.[99]
When under attack, some octopuses can perform arm autotomy, in a manner similar to the way skinks and other lizards detach their tails. The crawling arm may distract would-be predators. Such severed arms remain sensitive to stimuli and move away from unpleasant sensations.[100] Octopuses can replace lost limbs.[101]
Some octopuses, such as the mimic octopus, can combine their highly flexible bodies with their colour-changing ability to mimic other, more dangerous animals, such as lionfish, sea snakes, and eels.[102][103]
Pathogens and parasites
The diseases and parasites that affect octopuses have been little studied, but cephalopods are known to be the intermediate or final hosts of various parasitic cestodes, nematodes and copepods; 150 species of protistan and metazoan parasites have been recognised.[104] The Dicyemidae are a family of tiny worms that are found in the renal appendages of many species;[105] it is unclear whether they are parasitic or are endosymbionts. Coccidians in the genus Aggregata living in the gut cause severe disease to the host. Octopuses have an innate immune system, and the haemocytes respond to infection by phagocytosis, encapsulation, infiltration or cytotoxic activities to destroy or isolate the pathogens. The haemocytes play an important role in the recognition and elimination of foreign bodies and wound repair. Captive animals have been found to be more susceptible to pathogens than wild ones.[106] A gram-negative bacterium, Vibrio lentus, has been found to cause skin lesions, exposure of muscle and death of octopuses in extreme cases.[107]
Evolution
Further information: Evolution of cephalopods
Fossil history and phylogeny
Cephalopods have existed for 500 million years and octopus ancestors were in the Carboniferous seas 300 million years ago. The oldest known octopus fossil is Pohlsepia, which lived 296 million years ago. Researchers have identified impressions of eight arms, two eyes, and possibly an ink sac.[108] Octopuses are mostly soft tissue, and so fossils are relatively rare. Octopuses, squids and cuttlefish belong to the clade Coleoidea. They are known as "soft-bodied" cephalopods, lacking the external shell of most molluscs and other cephalopods like the Nautiloids and the extinct Ammonoidea.[109] Octopuses have eight arms like other coleoids but lack the extra specialised feeding appendages known as tentacles which are longer and thinner with suckers only at their club-like ends.[110][111][112] The vampire squid (Vampyroteuthis) also lacks tentacles but has sensory filaments.[113]
Two possible extant cephalopod phylogenies, based on genetics studies by Strugnell et al. 2007, are shown in the possible cladograms.[114]
Cladogram 1
Cephalopods
Nautiloids
Nautilus
Coleoids
Octopods
Vampyroteuthis
Squids and cuttlefish
Cladogram 2
Cephalopods
Nautiloids
Nautilus
Coleoids
Squids and cuttlefish
Vampyroteuthis
Octopods
Taxonomy
The scientific name Octopoda was first coined and given as the order of octopuses in 1818 by English biologist William Elford Leach,[115] who classified them as Octopoida the previous year.[2] The Octopoda consists of around 300 known species[116] and can be divided into two suborders, the Incirrina and the Cirrina. The incirrate octopuses (the majority of species) lack the cirri and paired swimming fins of the cirrates.[32] In addition, the internal shell of incirrates is either present as a pair of stylets or absent altogether.[117]
Order Octopoda
Life restoration of Keuppia levante, an extinct species from the Cretaceous
Genus †Keuppia (incertae sedis)
Genus †Palaeoctopus (incertae sedis)
Genus †Paleocirroteuthis (incertae sedis)
Genus †Pohlsepia (incertae sedis)
Genus †Proteroctopus (incertae sedis)
Genus †Styletoctopus (incertae sedis)
Suborder Cirrina: finned deep-sea octopus
Family Opisthoteuthidae: umbrella octopus
The flapjack octopus (Opisthoteuthis californiana)
Family Cirroctopodidae
Family Cirroteuthidae
Family Stauroteuthidae
Suborder Incirrina
Superfamily Octopodoidea[118]
Family Amphitretidae
Family Bathypolypodidae
Family Eledonidae
Family Enteroctopodidae
Family Megaleledonidae Taki, 1961
Family Octopodidae
Superfamily Argonautoidea
Shelled argonaut, Argonauta argo
Family Alloposidae: seven-arm octopus
Family Argonautidae: argonauts
Family Ocythoidae: tuberculate pelagic octopus
Family Tremoctopodidae: blanket octopus
RNA editing
Octopuses and other coleoid cephalopods are capable of greater RNA editing (which involves changes to the nucleic acid sequence of the primary transcript of RNA molecules) than any other organisms. Editing is concentrated in the nervous system and affects proteins involved in neural excitability and neuronal morphology. More than 60% of RNA transcripts for coleoid brains are recoded by editing, compared to less than 1% for a human or fruit fly. Coleoids rely mostly on ADAR enzymes for RNA editing, which requires large double-stranded RNA structures to flank to the editing sites. Both the structures and editing sites are conserved in the coleoid genome and the mutation rates for the sites are severely hampered. Hence, greater transcriptome plasticity has come as the cost of slower genome evolution. High levels of RNA editing do not appear to be present in more basal cephalopods or other molluscs.[119][120]
Relationship to humans
Minoan clay vase with octopus decoration, c. 1500 BC
Cultural references
Ancient seafaring people were aware of the octopus, as evidenced by certain artworks and designs. For example, a stone carving found in the archaeological recovery from Bronze Age Minoan Crete at Knossos (1900 – 1100 BC) has a depiction of a fisherman carrying an octopus.[121] The terrifyingly powerful Gorgon of Greek mythology has been thought to have been inspired by the octopus or squid, the octopus itself representing the severed head of Medusa, the beak as the protruding tongue and fangs, and its tentacles as the snakes.[122] The Kraken are legendary sea monsters of giant proportions said to dwell off the coasts of Norway and Greenland, usually portrayed in art as a giant octopus attacking ships. Linnaeus included it in the first edition of his 1735 Systema Naturae.[123][124] A Hawaiian creation myth says that the present cosmos is the last of a series which arose in stages from the ruins of the previous universe. In this account, the octopus is the lone survivor of the previous, alien universe.[125] The Akkorokamui is a gigantic octopus-like monster from Ainu folklore.[126]
The NROL-39 mission patch, depicting the National Reconnaissance Office as an octopus with a long reach
A battle with an octopus plays a significant role in Victor Hugo's book Travailleurs de la mer (Toilers of the Sea), relating to his time in exile on Guernsey.[127] Ian Fleming's 1966 short story collection Octopussy and The Living Daylights, and the 1983 James Bond film were partly inspired by Hugo's book.[128]
Japanese erotic art, shunga, includes ukiyo-e woodblock prints such as Katsushika Hokusai's 1814 print Tako to ama (The Dream of the Fisherman's Wife), in which an ama diver is sexually intertwined with a large and a small octopus.[129][130] The print is a forerunner of tentacle erotica.[131] The biologist P. Z. Myers noted in his science blog, Pharyngula, that octopuses appear in "extraordinary" graphic illustrations involving women, tentacles, and bare breasts.[132][133]
Since it has numerous arms emanating from a common centre, the octopus is often used as a symbol for a powerful and manipulative organisation, usually negatively.[134]
Danger
Pen and wash drawing of an imagined colossal octopus attacking a ship, by the malacologist Pierre de Montfort, 1801
Octopuses generally avoid humans, but incidents have been verified. For example, a 2.4-metre (8 ft) Pacific octopus, said to be nearly perfectly camouflaged, "lunged" at a diver and "wrangled" over his camera before it let go. Another diver recorded the encounter on video.[135]
All species are venomous, but only blue-ringed octopuses have venom that is lethal to humans.[136] Bites are reported each year across the animals' range from Australia to the eastern Indo-Pacific Ocean. They bite only when provoked or accidentally stepped upon; bites are small and usually painless. The venom appears to be able to penetrate the skin without a puncture, given prolonged contact. It contains tetrodotoxin, which causes paralysis by blocking the transmission of nerve impulses to the muscles. This causes death by respiratory failure leading to cerebral anoxia. No antidote is known, but if breathing can be kept going artificially, patients recover within 24 hours.[137][138] Bites have been recorded from captive octopuses of other species; they leave swellings which disappear in a day or two.[139]
Fisheries and cuisine
Main article: Octopus as food
Octopus fisheries exist around the world with total catches varying between 245,320 and 322,999 metric tons from 1986 to 1995.[140] The world catch peaked in 2007 at 380,000 tons, and fell by a tenth by 2012.[141] Methods to capture octopuses include pots, traps, trawls, snares, drift fishing, spearing, hooking and hand collection.[140] Octopus is eaten in many cultures and is a common food on the Mediterranean and Asian coasts.[142][143] The arms and sometimes other body parts are prepared in various ways, often varying by species or geography. Live octopuses are eaten in several countries around the world, including the US.[144][145] Animal welfare groups have objected to this practice on the basis that octopuses can experience pain.[146] Octopuses have a food conversion efficiency greater than that of chickens, making octopus aquaculture a possibility.[147]
In science and technology
In classical Greece, Aristotle (384 – 322 BC) commented on the colour-changing abilities of the octopus, both for camouflage and for signalling, in his Historia animalium: "The octopus ... seeks its prey by so changing its colour as to render it like the colour of the stones adjacent to it; it does so also when alarmed."[148] Aristotle noted that the octopus had a hectocotyl arm and suggested it might be used in sexual reproduction. This claim was widely disbelieved until the 19th century. It was described in 1829 by the French zoologist Georges Cuvier, who supposed it to be a parasitic worm, naming it as a new species, Hectocotylus octopodis.[149][150] Other zoologists thought it a spermatophore; the German zoologist Heinrich Müller believed it was "designed" to detach during copulation. In 1856 the Danish zoologist Japetus Steenstrup demonstrated that it is used to transfer sperm, and only rarely detaches.[151]
Octopus in captivity at Aquarium Finisterrae in Corunna, Galicia, Spain. These animals are known to escape from their tanks.
Octopuses offer many possibilities in biological research, including their ability to regenerate limbs, change the colour of their skin, behave intelligently with a distributed nervous system, and make use of 168 kinds of protocadherins (humans have 58), the proteins that guide the connections neurons make with each other. The California two-spot octopus has had its genome sequenced, allowing exploration of its molecular adaptations.[152] Having independently evolved mammal-like intelligence, octopuses have been compared to hypothetical intelligent extraterrestrials.[153] Their problem-solving skills, along with their mobility and lack of rigid structure enable them to escape from supposedly secure tanks in laboratories and public aquariums.[154]
Due to their intelligence, octopuses are listed in some countries as experimental animals on which surgery may not be performed without anesthesia, a protection usually extended only to vertebrates. In the UK from 1993 to 2012, the common octopus (Octopus vulgaris) was the only invertebrate protected under the Animals (Scientific Procedures) Act 1986.[155] In 2012, this legislation was extended to include all cephalopods[156] in accordance with a general EU directive.[157]
Some robotics research is exploring biomimicry of octopus features. Octopus arms can move and sense largely autonomously without intervention from the animal's central nervous system. In 2015 a team in Italy built soft-bodied robots able to crawl and swim, requiring only minimal computation.[158] In 2017 a German company made an arm with a soft pneumatically controlled silicone gripper fitted with two rows of suckers. It is able to grasp objects such as a metal tube, a magazine, or a ball, and to fill a glass by pouring water from a bottle.[159]
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Jump up ^ Gofas, S. (2009). "Octopoda". World Register of Marine Species. Retrieved 5 May 2017.
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Jump up ^ Philippe Bouchet (2015). "Octopodoidea d'Orbigny, 1840". World Register of Marine Species. Flanders Marine Institute. Retrieved 3 February 2018.
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Jump up ^ Liscovitch-Brauer, N.; Alon, S.; Porath, H. T.; Elstein, B.; Unger, R.; Ziv, T.; Admon, A.; Levanon, E. Y.; Rosenthal, J. J. C.; Eisenberg, E. (2017). "Trade-off between transcriptome plasticity and genome evolution in cephalopods". Cell. 169 (2): 191–202. doi:10.1016/j.cell.2017.03.025.
Jump up ^ Hogan, C. Michael (22 December 2007). "Knossos fieldnotes". The Modern Antiquarian.
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Jump up ^ "Caroli Linnaei Systema naturae sistens regna tria naturae". google.com.
Jump up ^ Smedley, Edward; Rose, Hugh James; Rose, Henry John (1845). Encyclopaedia Metropolitana, Or, Universal Dictionary of Knowledge: Comprising the Twofold Advantage of a Philosophical and an Alphabetical Arrangement, with Appropriate Engravings. B. Fellowes. pp. 255–.
Jump up ^ Dixon, Roland Burrage (1916). Oceanic. The Mythology of All Races. 9. Marshall Jones Company. pp. 2–.
Jump up ^ Batchelor, John (1901). The Ainu and Their Folklore. London: The Religious Tract Society.
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Jump up ^ Cohen-Vrignaud, Gerard (2012). "On Octopussies, or the Anatomy of Female Power". differences. 23 (2): 32–61. doi:10.1215/10407391-1533520.
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Jump up ^ Uhlenbeck, Chris; Margarita Winkel; Ellis Tinios; Amy Reigle Newland (2005). Japanese Erotic Fantasies: Sexual Imagery of the Edo Period. Hotei. p. 161. ISBN 90-74822-66-5.
Jump up ^ Briel, Holger (2010). Berninger, Mark; Ecke, Jochen; Haberkorn, Gideon, eds. The Roving Eye Meets Traveling Pictures: The Field of Vision and the Global Rise of Adult Manga. Comics As a Nexus of Cultures: Essays on the Interplay of Media, Disciplines. McFarland. p. 203. ISBN 978-0-7864-3987-4.
Jump up ^ Myers, P. Z. (17 May 2017). "Extraordinary Octopus Illustrations". Pharyngula. Retrieved 18 March 2017.
Jump up ^ Myers, P. Z. (29 October 2006). "Definitely not safe for work". Pharyngula. Retrieved 18 March 2017.
Jump up ^ Smith, S. (26 February 2010). "Why Mark Zuckerberg Octopus Cartoon Evokes 'Nazi Propaganda,' German Paper Apologizes". iMediaEthics. Retrieved 31 May 2017.
Jump up ^ Ross, Philip (18 February 2014). "8-Foot Octopus Wrestles Diver Off California Coast, Rare Encounter Caught on Camera". International Business Times.
Jump up ^ "Tentacles of venom: new study reveals all octopuses are venomous". University of Melbourne. 15 April 2009.
Jump up ^ "Blue-ringed Octopuses, Hapalochlaena maculosa". The MarineBio Conservation Society. Retrieved 12 April 2017.
Jump up ^ Caldwell, Roy. "What makes blue-rings so deadly? Blue-ringed octopus have tetrodotoxin". The Cephalopod Page. Retrieved 12 April 2017.
Jump up ^ Wells (1978), pp. 68.
^ Jump up to: a b Gillespie, G. E.; Parker, G.; Morrison, J. (1998). "A Review of Octopus Fisheries Biology and British Columbia Octopus Fisheries" (PDF). Canadian Stock Assessment Secretariat.
Jump up ^ Rocliffe, S.; Harris, A. (2016). "The status of octopus fisheries in the Western Indian Ocean". Retrieved 18 June 2017.
Jump up ^ Cushman, Abi (24 August 2014). "Common octopus". Animal fact guide.
Jump up ^ "Giant Pacific octopus". Monterey Bay Aquarium. 2017.
Jump up ^ Eriksen, L. (10 November 2010). "Live and let dine". The Guardian. Retrieved 15 April 2015.
Jump up ^ Killingsworth, Silvia (3 October 2014). "Why not eat octopus?". The New Yorker. Retrieved 15 April 2016.
Jump up ^ Ferrier, M. (30 May 2010). "Macho foodies in New York develop a taste for notoriety". The Guardian. Retrieved 15 April 2015.
Jump up ^ Wells, Martin (1983). "Cephalopods do it differently". New Scientist. Reed Business Information. 100 (1382): 333–334. ISSN 0262-4079.
Jump up ^ Aristotle (c. 350 BC). Historia animalium. IX, 622a: 2–10. Cited in Borrelli, Luciana; Gherardi, Francesca; Fiorito, Graziano (2006). A catalogue of body patterning in Cephalopoda. Firenze University Press. ISBN 978-88-8453-377-7. Abstract
Jump up ^ Leroi, Armand Marie (2014). The Lagoon: How Aristotle Invented Science. Bloomsbury. pp. 71–72. ISBN 978-1-4088-3622-4.
Jump up ^ "The Cephalopoda". University of California Museum of Paleontology. Retrieved 27 March 2017.
Jump up ^ Mann, T. (2012). Spermatophores: Development, Structure, Biochemical Attributes and Role in the Transfer of Spermatozoa. Springer. p. 28. ISBN 978-3-642-82308-4.
Jump up ^ Singer, Emily (26 July 2016). "Biologists Search for New Model Organisms". Quanta Magazine.
Jump up ^ Baer, Drake (20 December 2016). "Octopuses Are 'the Closest We Will Come to Meeting an Intelligent Alien'". Science of Us. Retrieved 26 April 2017.
Jump up ^ Brulliard, Karin (13 April 2016). "Octopus slips out of aquarium tank, crawls across floor, escapes down pipe to ocean". The Washington Post. Retrieved 20 February 2017.
Jump up ^ "The Animals (Scientific Procedures) Act (Amendment) Order 1993". The National Archives. Retrieved 18 February 2015.
Jump up ^ "The Animals (Scientific Procedures) Act 1986 Amendment Regulations 2012". The National Archives. Retrieved 18 February 2015.
Jump up ^ "Directive 2010/63/EU of the European Parliament and of the Council". Article 1, 3(b) (see page 276/39): Official Journal of the European Union. Retrieved 18 February 2015.
Jump up ^ "Octopus-Inspired Robots Can Grasp, Crawl, and Swim". IEEE Spectrum. 5 April 2015.
Jump up ^ Burgess, Matt (27 March 2017). "This robotic octopus tentacle isn't creepy at all". Wired.
Sources
Wells, M. J. (1978). Octopus, Physiology and Behaviour of an Advanced Invertebrate. Springer Science & Business Media. ISBN 978-94-017-2470-8.
Courage, K. H. (2013). Octopus!, The Most Mysterious Creature in the Sea. Penguin Group. ISBN 978-0-698-13767-7.
Mather, J. A.; Anderson, R. C.; Wood, J. B. (2010). Octopus: The Ocean's Intelligent Invertebrate. Timber Press. ISBN 978-1-60469-067-5.
External links
The Wikibook Dichotomous Key has a page on the topic of: Octopoda
Octopuses – Overview at the Encyclopedia of Life
Octopoda at the Tree of Life Web Project
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Taxon identifiers
Wd: Q40152
ADW: Octopoda
EoL: 2315
Fossilworks: 61473
GBIF: 459
IRMNG: 11705
ITIS: 82589
NCBI: 6638
NZOR: 95190945-22e3-473b-9072-c303dd315db1
uBio: 513337
WoRMS: 11718
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i
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/ˈ/: primary stress follows
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/ɒ/: 'o' in 'body'
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'p' in 'pie'
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'd' in 'dye'
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/wiki/File:Snails-Italy.jpg image
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/wiki/Helix_pomatia Helix pomatia
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/wiki/Helix_aspersa mw-redirect Helix aspersa
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/wiki/Helix_aperta Helix aperta
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/wiki/Cepaea_nemoralis mw-redirect Cepaea nemoralis
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/wiki/Otala_lactea Otala lactea
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/wiki/Escargot Escargot
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navbox-list navbox-even hlist text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px
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display: none;
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/wiki/Bivalve mw-redirect Bivalve
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/wiki/Scallop Scallop
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/wiki/Queen_scallop Queen scallop
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/wiki/Pecten_maximus Pecten maximus
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/wiki/Pecten_jacobaeus Pecten jacobaeus
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/wiki/Argopecten_irradians Argopecten irradians
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/wiki/Placopecten_magellanicus Placopecten magellanicus
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/wiki/Clam Clam
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/wiki/Atlantic_surf_clam Atlantic surf clam
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/wiki/Soft-shell_clam Soft-shell clam
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/wiki/Mercenaria_mercenaria mw-redirect Mercenaria mercenaria
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/wiki/Austrovenus_stutchburyi Austrovenus stutchburyi
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/wiki/Saxidomus_nuttalli Saxidomus nuttalli
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/wiki/Arctica_islandica Arctica islandica
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/wiki/Cockle_(bivalve) Cockle (bivalve)
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/wiki/Geoduck Geoduck
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/wiki/Spisula_solidissima mw-redirect Spisula solidissima
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/wiki/Paphies_ventricosa Paphies ventricosa
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/wiki/Paphies_australis Paphies australis
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/wiki/Tuatua Tuatua
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/wiki/Ruditapes_largillierti Ruditapes largillierti
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a
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/wiki/Grooved_carpet_shell Grooved carpet shell
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display: none;
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/wiki/Oyster Oyster
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/wiki/Mussel Mussel
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href class title
/wiki/Pearl_oyster mw-redirect Pearl oyster
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/wiki/Pinctada_maxima Pinctada maxima
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display: none;
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/wiki/Freshwater_pearl_mussel Freshwater pearl mussel
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display: none;
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/wiki/Cephalopods mw-redirect Cephalopods
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mw-selflink selflink
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/wiki/Squid Squid
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/wiki/Heliciculture Heliciculture
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/wiki/Gathering_seafood_by_hand Gathering seafood by hand
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/wiki/Clam_digging Clam digging
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href class title
/wiki/Scallop_dredge mw-redirect Scallop dredge
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/wiki/Oyster_farming Oyster farming
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/wiki/Bugeye_(boat) mw-redirect Bugeye (boat)
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/wiki/Pearl#Pearl_farming Pearl
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/wiki/Pearl_diving mw-redirect Pearl diving
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/wiki/Ama_divers mw-redirect Ama divers
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/wiki/Trawling Trawling
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display: none;
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/wiki/List_of_fishing_topics_by_subject mw-redirect List of fishing topics by subject
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navbox-abovebelow 3
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nowraplinks collapsible autocollapse navbox-inner border-spacing:0;background:transparent;color:inherit collapsibleTable1
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role class aria-labelledby style
navigation navbox Commercial_mollusks padding:3px
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collapseButton2 #
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collapseButton
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abbr
title style
View this template ;;background:none transparent;border:none;-moz-box-shadow:none;-webkit-box-shadow:none;box-shadow:none;
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href title
/wiki/Template:Edible_molluscs Template:Edible molluscs
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nv-view
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title style
Discuss this template ;;background:none transparent;border:none;-moz-box-shadow:none;-webkit-box-shadow:none;box-shadow:none;
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/wiki/Template_talk:Edible_molluscs Template talk:Edible molluscs
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nv-talk
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title style
Edit this template ;;background:none transparent;border:none;-moz-box-shadow:none;-webkit-box-shadow:none;box-shadow:none;
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external text //en.wikipedia.org/w/index.php?title=Template:Edible_molluscs&action=edit
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nv-edit
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plainlinks hlist navbar mini
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/wiki/Category:Edible_molluscs Category:Edible molluscs
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/wiki/Bivalvia Bivalvia
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/wiki/Clam Clam
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/wiki/Atlantic_jackknife_clam Atlantic jackknife clam
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a
href title
/wiki/Atlantic_surf_clam Atlantic surf clam
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href title
/wiki/Geoduck Geoduck
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a
href title
/wiki/Grooved_carpet_shell Grooved carpet shell
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href title
/wiki/Hard_clam Hard clam
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href class title
/wiki/Horse_clam mw-redirect Horse clam
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href title
/wiki/Mactra_stultorum Mactra stultorum
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/wiki/Mya_truncata Mya truncata
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/wiki/Arctica_islandica Arctica islandica
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/wiki/Pacific_razor_clam Pacific razor clam
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href title
/wiki/Ruditapes_largillierti Ruditapes largillierti
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href title
/wiki/Saxidomus_nuttalli Saxidomus nuttalli
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a
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/wiki/Senilia_senilis Senilia senilis
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li
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a
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/wiki/Smooth_clam Smooth clam
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a
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/wiki/Soft-shell_clam Soft-shell clam
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href class title
/wiki/Spisula_aequilateralis mw-redirect Spisula aequilateralis
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/wiki/Tuatua Tuatua
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/wiki/Venerupis_philippinarum Venerupis philippinarum
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/wiki/Razor_shell Razor shell
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/wiki/Pod_razor Pod razor
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/wiki/Ensis Ensis
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/wiki/Paphies Paphies
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/wiki/Cockle_(bivalve) Cockle (bivalve)
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row navbox-group width:1%
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href class title
/wiki/Cerastoderma_edule mw-redirect Cerastoderma edule
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href class title
/wiki/Blood_cockle mw-redirect Blood cockle
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href title
/wiki/Plebidonax_deltoides Plebidonax deltoides
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/wiki/Austrovenus_stutchburyi Austrovenus stutchburyi
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/wiki/Sydney_cockle Sydney cockle
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/wiki/Mussel Mussel
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/wiki/Blue_mussel Blue mussel
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/wiki/Mediterranean_mussel Mediterranean mussel
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/wiki/New_Zealand_green-lipped_mussel mw-redirect New Zealand green-lipped mussel
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/wiki/California_mussel California mussel
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/wiki/Perna_perna Perna perna
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/wiki/Perna_viridis Perna viridis
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/wiki/Lithophaga_lithophaga Lithophaga lithophaga
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/wiki/Mytilidae Mytilidae
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href title
/wiki/Oyster Oyster
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href class title
/wiki/Auckland_oyster mw-redirect Auckland oyster
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href title
/wiki/Eastern_oyster Eastern oyster
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a
href class title
/wiki/Olympia_oyster mw-redirect Olympia oyster
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/wiki/Ostrea_angasi Ostrea angasi
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/wiki/Ostrea_edulis Ostrea edulis
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/wiki/Pacific_oyster Pacific oyster
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/wiki/Portuguese_oyster Portuguese oyster
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/wiki/Windowpane_oyster Windowpane oyster
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href title
/wiki/Rock_oyster Rock oyster
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/wiki/Sydney_rock_oyster Sydney rock oyster
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href class title
/wiki/Tiostrea_chilensis mw-redirect Tiostrea chilensis
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/wiki/Gillardeau_oysters Gillardeau oysters
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/wiki/Crassostrea Crassostrea
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href title
/wiki/Scallop Scallop
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row navbox-group width:1%
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href title
/wiki/Argopecten_irradians Argopecten irradians
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href title
/wiki/Pecten_maximus Pecten maximus
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href title
/wiki/Pecten_novaezelandiae Pecten novaezelandiae
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/wiki/Pecten_jacobaeus Pecten jacobaeus
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href title
/wiki/Argopecten_purpuratus Argopecten purpuratus
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href title
/wiki/Patinopecten_yessoensis Patinopecten yessoensis
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/wiki/Placopecten_magellanicus Placopecten magellanicus
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padding:0em 0.25em
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tbody
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nowraplinks navbox-subgroup border-spacing:0
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navbox-list navbox-odd text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px
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display: none;
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href title
/wiki/Gastropoda Gastropoda
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scope class style
row navbox-group width:1%
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style
padding:0em 0.25em
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href title
/wiki/Abalone Abalone
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scope class style
row navbox-group width:1%
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a
href title
/wiki/Haliotis_sorenseni Haliotis sorenseni
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href title
/wiki/Haliotis_rufescens Haliotis rufescens
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href title
/wiki/Haliotis_cracherodii Haliotis cracherodii
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href title
/wiki/Haliotis_fulgens Haliotis fulgens
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li
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href title
/wiki/Haliotis_corrugata Haliotis corrugata
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li
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a
href title
/wiki/Haliotis_rubra Haliotis rubra
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li
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a
href title
/wiki/Haliotis_laevigata Haliotis laevigata
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li
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href title
/wiki/Green_ormer Green ormer
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href title
/wiki/P%C4%81ua Pāua
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href title
/wiki/Haliotis_midae Haliotis midae
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href title
/wiki/Concholepas_concholepas Concholepas concholepas
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padding:0em 0.25em
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navbox-list navbox-even text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px
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href title
/wiki/Conch Conch
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scope class style
row navbox-group width:1%
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/wiki/Lobatus_gigas Lobatus gigas
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li
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href title
/wiki/Lentigo_pipus Lentigo pipus
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href class title
/wiki/Strombus_canarium mw-redirect Strombus canarium
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padding:0em 0.25em
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navbox-list navbox-odd text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px
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href title
/wiki/Limpet Limpet
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scope class style
row navbox-group width:1%
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a
href title
/wiki/Cellana_exarata Cellana exarata
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li
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a
href title
/wiki/Cellana_talcosa Cellana talcosa
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li
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a
href title
/wiki/Cellana_sandwicensis Cellana sandwicensis
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li
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a
href title
/wiki/Patella_ulyssiponensis Patella ulyssiponensis
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li
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a
href title
/wiki/Patella_vulgata Patella vulgata
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li
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a
href title
/wiki/Patella_caerulea Patella caerulea
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li
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a
href title
/wiki/Patella_ferruginea Patella ferruginea
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/wiki/Patella_rustica Patella rustica
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padding:0em 0.25em
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/w/index.php?title=Octopus&oldid=838414773 Permanent link to this revision of the page
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