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Echinoecus klunzingeri

Echinoecus pentagonus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Infraorder: Brachyura
Superfamily: Pilumnoidea
Family: Pilumnidae
Genus: Echinoecus
Species: E. pentagonus
Binomial name
Echinoecus pentagonus
(A. Milne-Edwards, 1879) 

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:



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