Anelosimus jabaquara is a species of spider found in subtropical, humid, lowland forests in Brazil. Anelosimus jabaquara was first described by Herbert W. Levi in 1956. These spiders cooperate to spin and repair the colonial web, capture prey, and care for the brood. Colony size is small, and the sex ratio is biased towards females. Description Adult males are on average smaller than adult females. The mean male cephalothorax length is 1.38 cm, while the mean female cephalothorax length is 1.62 cm. Similar to other Anelosimus species, Anelosimus jabaquara has a minute colulus, three teeth on the anterior margin of the chelicerae and denticles on the posterior. The palpus distinguishes this species from others. The eyes are subequal in size. For males, the carapace and sternum are orange-yellow. The legs are dusky yellow. The abdomen is dusky with dorsal and ventral black bands. For females, the carapace is red, except for black rings around the eyes. The clypeus, chelicerae, and endites are orange, and the sternum and labium are red. The legs are light brown with darker segments on the distal end. The tibiae and femora have dark rings in the middle. The abdomen is dark brown with a dorsal medium band containing black spots. Life cycle Anelosimus jabaquara females have one brood per year, and develop through eight instars (stages). Males begin dying soon after copulation; males are not involved in brood care. Spiderlings go through their first instar while inside the egg sac. The spiderlings leave the egg sac in their second instar, however the protective behavior of the female remains. Females feed their spiderlings through regurgitation. This happens until the spiderlings reach the third instar, when they are then able to capture small prey on their own. During the fourth instar, the juveniles of one brood will mix with other broods, capturing prey together in groups. Females begin dying when their brood reaches the 5th instar. Behavior Reproduction Anelosimus jabaquara reproduction begins in December, and the brood develops from April to October through the care of the females. Each female lays at least one egg sac containing around 27 eggs. The female is able to produce a second sac after abandoning the first. If a female's egg sac is experimentally removed, she will try to steal an egg sac from another female. Female size is positively correlated with clutch size. Daily activity The spiders remain under leaves