Echinoecus

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 <small>Miyake, 1939</small> – Japan, on Heliocidaris crassispina (Echinometridae) and Pseudocentrotus depressus (Strongylocentrotidae)
• Echinoecus pentagonus <small>(A. Milne-Edwards, 1879)</small> – East Africa and Red Sea to Hawaii and French Polynesia, on Diadema savignyi, D. setosum, Echinothrix calamaris and E. diadema (Diadematidae), Heterocentrotus mammillatus (Echinometridae) and Pseudocentrotus depressus (Strongylocentrotidae)
• Echinoecus sculptus <small>(Ward, 1934)</small> – Christmas Island, on Colobocentrotus atratus (Echinometridae)

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