Spinulosida

Spinulosida

Echinaster sepositus
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Eleutherozoa
Class:	Asteroidea
Order:	Spinulosida Perrier, 1884
Families
See text

Spinulosida are an order of sea stars containing at least 120 species.

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.^[1] No fossil spinulosids have yet been found.^[2]

Taxonomy

Family Echinasteridae
- Genus Echinaster Müller and Troschel, 1840
- Genus Henricia Gray, 1840
- Genus Odontohenricia Rowe and Albertson, 1988
- Genus Poraniopsis Perrier, 1891
- Genus Stegnaster Sladen, 1889
Family Mithrodiidae^[3]
- Genus Mithrodia Gray, 1840
- Genus Thromidia Pope & Rowe, 1977

References

^ 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. http://palaeo.gly.bris.ac.uk/Palaeofiles/Fossilgroups/asteroz2/index_f/mod_fm.html. Retrieved 2010-07-30.
^ "The World Asteroidea Database - Mithrodiidae". Marinespecies.eu. http://www.marinespecies.eu/asteroidea/aphia.php?p=taxdetails&id=149873. Retrieved 2010-07-30.