Echinothurioida

Echinothurioida
Temporal range:
Fire urchin (Asthenosoma varium)
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Infraclass: Aulodonta
Superorder: Echinothuriacea
Order: Echinothurioida
Claus, 1880
Families

See text

The Echinothurioida are an order of sea urchins in the class Echinoidea. Echinothurioids are distinguished from other sea urchins by the combination of a flexible test and hollow spines. The membrane around the mouth contains only simple plates, in contrast to the more complex mouth parts of their close relatives, the Diadematoida. They are nearly all deepsea dwellers.

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