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 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)];

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 classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea (early asterozoans with unclear relationships to extant classes).^[2] A fifth class, Concentricycloidea, was proposed for the unusual genus Xyloplax (sea daisies),^[4] but was later demoted to the status of infraclass as the sister of Neoasteroidea within the asteroidean sublcass Ambuloasteroidea.^[5]

^ K. A. von Zittel. 1895. Grundzuge der Palaeontologie 1-971
^ ^a ^b Nanglu et al. 2023, p. 331
^ Spencer & Wright 1966, p. U39
^ Rowe, Baker & Clark 1988
^ Mah 2006

[1] K. A. von Zittel. 1895. Grundzuge der Palaeontologie 1-971

[nanglu2023-2] Nanglu et al. 2023, p. 331

[3] Spencer & Wright 1966, p. U39

[4] Rowe, Baker & Clark 1988

[5] Mah 2006

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Asterozoa

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