Leucosiidae - Purse Crabs

Purse crabs were named so because their abdomen folds underneath the body (like all true crabs) and forms a large purse-like pocket. The pockets are used to brood egg masses and to protect the egg masses from chafing on the sand as the crab backs in to the sediment to bury itself, leaving only its rostrum extending above the surface. Their bodies are round, and their legs and claw appendages are long and slender. There are usually 2-5 spines at the lateral posterior end of their carapace.