Holasteroida

Holasteroida
Temporal range:
Pourtalesia wandeli
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Euechinoidea
Infraclass: Irregularia
Superorder: Atelostomata
Order: Holasteroida
Durham & Melville, 1957

Holasteroida is an order of irregular sea urchins.