#matutidae

"Moon Crabs" (Family: Matutidae)

...are a family of Clappoid crabs which are widely distributed throughout the Indo-Pacific region, including the Red Sea. Like the unrelated swimming crabs (Portunidae) the legs of Matutids are specially adapted for swimming and digging. However, unlike Portunids which only have the lack pair of legs modified for swimming all five pair of Matutid legs are modified. Moon crabs are known to be "aggressive predators", feeding on a range of invertebrates. 

Classification

Animalia-Arthropoda-Crustacea-Malacostraca-Decapoda-Brachyura-Clappoidea-Matutidae