Spinulosida

Spinulosida
	Echinaster sepositus
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Asteroidea
Superorder:	Spinulosacea
Order:	Spinulosida; Perrier, 1884 [1]
Families
	2 , see text.

The Spinulosida are an order of sea stars containing at least 120 species in seven genera and two families.

Spinulosids completely lack pedicellariae and have a delicate skeletal arrangement. Their name comes from the presence of numerous low spines on the aboral (upper) surface.[2] No fossil spinulosids have yet been found.[3]

Taxonomy

The following family is recognised by the World Register of Marine Species:[1]

Echinasteridae Verrill, 1870

References

Mah, C. (2015). Mah CL (ed.). "Spinulosida Perrier, 1884". World Asteroidea database. World Register of Marine Species. Retrieved 2015-07-23.
Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 948. ISBN 0-03-056747-5.
"Asterozoa: Fossil groups: SciComms 05-06: Earth Sciences". Palaeo.gly.bris.ac.uk. 2005-11-22. Retrieved 2010-07-30.

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[WoRMS-1] Mah, C. (2015). Mah CL (ed.). "Spinulosida Perrier, 1884". World Asteroidea database. World Register of Marine Species. Retrieved 2015-07-23.

[IZ-2] Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 948. ISBN 0-03-056747-5.

[3] "Asterozoa: Fossil groups: SciComms 05-06: Earth Sciences". Palaeo.gly.bris.ac.uk. 2005-11-22. Retrieved 2010-07-30.