Kingdom Animalia Subphylum Crustacea Order Decapoda | Phylum Arthropoda Class Malacostraca Infraorder Brachyura | |
The "sea urchin crab" Echinoecus pentagonus is a species of crab in the family Pilumnidae found from the Red Sea and East Africa to French Polynesia and the Hawaiian Islands. This crab is a parasite that lives in the rectum of a sea urchin. In Hawaii, it chooses only Echinothrix calamaris, leaving few of these urchins unpopulated. Its curved and pointed carapace reaches only 0.5 inches (1.3 cm) in width.
Taxonomic synonyms of E. pentagonus include:
References
Echinoecus pentagonus Wikipedia(Text) CC BY-SA