Tags: Crustacean.
Echinoecus is a genus of crabs that live in association with sea urchins. Formerly considered monotypic the genus is now thought to contain three species:Echinoecus nipponicus Miyake 1939 – Japan on Heliocidaris crassispina (Echinometridae) and Pseudocentrotus depressus (Strongylocentrotidae)Echinoecus pentagonus (A. Milne-Edwards 1879) – East Africa and Red Sea to Hawaii and French Polynesia on Diadema savignyi D. setosum Echinothrix calamaris and E.