Squat lobsters are dorsoventrally flattened crustaceans with long tails held curled beneath the cephalothorax. They are found in the two superfamilies Galatheoidea and Chirostyloidea, which form part
Squat lobsters can form dense aggregations.
Porcelain crabs, like Neopetrolisthes maculatus, are closely related to squat lobsters.
Dorsal (left) and ventral (right) views of the holotype of Kiwa puravida (Kiwaidae); two pereiopods have broken off on the animal's left side.
Anomura is a group of decapod crustaceans, including hermit crabs and others. Several groups such as the king crabs and porcelain crabs within the Anomura have independently undergone carcinisation, a
Aegla sp. from Nahuel Huapi Lake, Bariloche, Argentina