Asterozoa

Asterozoa; Temporal range: Late Cambrian/Early Ordovician to Holocene
	A brittle star on a starfish
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Asterozoa; von Zittel, 1895
Classes
	Asteroidea; Ophiuroidea; †Somasteroidea
Synonyms
	Stelleroidea Gregory, 1900;

The Asterozoa are a subphylum in the phylum Echinodermata. Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the class Asteroidea (the starfish), the class Ophiuroidea (the brittle stars and basket stars), and the extinct order Somasteroidea.