Asterozoa

Asterozoa Temporal range: 488.2–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N 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[1]
Classes[2]
Asteroidea de Blainville, 1830 Ophiuroidea Gray, 1840 †Somasteroidea Spencer, 1951 †Stenuroidea Spencer, 1951
Synonyms
Stelleroidea Lamarck, 1816 [nom. transl. et correct. Gregory, 1900 (pro les Stellerides Lamarck, 1816)][3]

The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa. 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 taxa Somasteroidea and Stenuroidea.^[2]