This is a partial list of edible molluscs. Molluscs are a large phylum of invertebrate animals, many of which have shells. Edible molluscs are harvested from saltwater, freshwater, and the land, and include numerous members of the classes Gastropoda (snails), Bivalvia (clams, scallops, oysters etc.), Cephalopoda (octopus and squid), and Polyplacophora (chitons). Many species of molluscs are eaten worldwide, either cooked or raw. Some mollusc species are commercially exploited and shipped as part of the international trade in shellfish; other species are harvested, sold and consumed locally. Some species are collected and eaten locally but are rarely bought and sold. A few species of molluscs are not commonly eaten now, but were eaten in historical or prehistoric times. The list is divided into marine and non-marine (terrestrial and freshwater) species, and within those divisions, the lists are primarily arranged taxonomically, so that related species are grouped together. Marine species Gastropods (snails) These sea snails are edible; some are listed by genus, others by species and others by their common name. Most species of abalone, including: Abalone Black abalone Blacklip abalone Green abalone Green ormer Haliotis corrugata Red abalone White abalone Pāua Many species of true limpets, including: Cellana exarata Cellana sandwicensis Patella caerulea Patella ferruginea Patella rustica Patella ulyssiponensis Patella vulgata Many species of winkles, including: Austrolittorina antipodum Common periwinkle Littorina sitkana and other species in the family Littorinidae Many species of conchs, including: Lobatus gigas Laevistrombus canarium Some rock snail species, including: Chorus giganteus Concholepas concholepas Turbo bruneus Turbo cornutus Turbo intercostalis Tectus niloticus Many species of whelks, Buccinidae, including: Channeled whelk Lightning whelk Knobbed whelk Other sea snail groups: Bullacta exarata, a bubble snail Amphibola crenata, an air-breathing mud snail melo melo a volute snail euspira heros a large moon snail Bivalves (clams etc.) Note that the common names of edible bivalves can be misleading, in that not all species known as "cockles" "oysters", "mussels", etc., are closely related. Ark clams (Arcidae), including: Blood cockle Senilia senilis Many species of true mussels, family Mytilidae, including: Blue mussel California mussel Mediterranean mussel Mytilus coruscus Perna canaliculus Perna perna Perna viridis Many species of Pen shell including: Atrina rigida Pinna carnea Pinna nobilis Many species of true oysters, including: Auckland oyster Dredge oyster Mangrove oyster Ostrea angasi Ostrea edulis Pacific oyster Rock oysters Saccostrea glomerata (Sydney rock oyster) Saccostrea echinata (Tropical black-lip rock oyster Portuguese oyster Eastern oyster Many species