Echinoecus

Echinoecus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Decapoda
Infraorder:	Brachyura
Superfamily:	Pilumnoidea
Family:	Pilumnidae
Genus:	Echinoecus; Rathbun, 1894 [1]
Type species
	Echinoecus pentagonus; Rathbun, 1894
Synonyms [2]
	Proechinoecus Ward, 1934

Echinoecus is a genus of crabs that live in association with sea urchins.[2] Formerly considered monotypic, the genus is now thought to contain three species:[2]

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. diadema (Diadematidae), Heterocentrotus mammillatus (Echinometridae) and Pseudocentrotus depressus (Strongylocentrotidae)
Echinoecus sculptus (Ward, 1934) – Christmas Island, on Colobocentrotus atratus (Echinometridae)

References

Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 138. Archived from the original (PDF) on 2011-06-06.
Diana G. B. Chia; Peter Castro; Peter K. L. Ng (1999). "Revision of the genus Echinoecus (Decapoda: Brachyura: Eumedonidae), crabs symbiotic with sea urchins". Journal of Crustacean Biology. 19 (4): 809–824. doi:10.1163/193724099x00529. JSTOR 1549303.

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[Grave-1] Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 138. Archived from the original (PDF) on 2011-06-06.

[Chia-2] Diana G. B. Chia; Peter Castro; Peter K. L. Ng (1999). "Revision of the genus Echinoecus (Decapoda: Brachyura: Eumedonidae), crabs symbiotic with sea urchins". Journal of Crustacean Biology. 19 (4): 809–824. doi:10.1163/193724099x00529. JSTOR 1549303.