Echinoidea: Order Echinothurioida (Deep-sea Sea Urchins)

Family: Echinothuriidae

Genus and Selected Species	Image
Araeosoma belli
Asthenosoma varium
Calveriosoma gracile
Hapalosoma amynina
Hygrosoma petersii
Sperosoma crassispinum
Tromikosoma hispidum

Family: Kamptosomatidae

Genus and Selected Species	Image
Kamptosoma asterias

Family: Phormosomatidae

Genus and Selected Species	Image
Hemiphormosoma paucispinum
Paraphormosoma alternans
Phormosoma placenta

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