Diadematacea

Diadematacia Temporal range: Late Triassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Echinothrix diadema
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Subclass:	Euechinoidea
Superorder:	Diadematacia
Orders
Diadematoida Echinothurioida Pedinoida

Diadematacia is a superorder of sea urchins. Unlike most other sea urchins, they generally have hollow spines. The tubercles on their test are perforated, and most species possess gills.

References

• Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 980. ISBN 0-03-056747-5.