Cyrtocrinida

Cyrtocrinida
	Holopus sp.
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Crinoidea
Order:	Cyrtocrinida[1]

Cyrtocrinida is an order of sea lilies which contains two suborders and three families.

Characteristics

Members of this order have stems consisting of a single skeletal unit or a very small number of units. There are no cirri, and the expanded base of the stem attaches directly to the substrate. The calyx may be asymmetrical and consists of five arms attached to five radial ossicles. The arms subdivide at arm ossicle I or II.[2]

Families

The World Register of Marine Species includes the following groups in the order:[1]

Suborder Cyrtocrinina
- Family Sclerocrinidae Jaekel, 1918

Suborder Holopodina
- Family Eudesicrinidae Bather, 1899
- Family Holopodidae Zittel, 1879

References

Messing, Charles (2013). "Cyrtocrinida". WoRMS. World Register of Marine Species. Retrieved 13 March 2019.
O'Hara, Timothy; Byrne, Maria (2017). Australian Echinoderms: Biology, Ecology and Evolution. Csiro Publishing. pp. 191–192. ISBN 978-1-4863-0763-0.

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[WoRMS-1] Messing, Charles (2013). "Cyrtocrinida". WoRMS. World Register of Marine Species. Retrieved 13 March 2019.

[OHara-2] O'Hara, Timothy; Byrne, Maria (2017). Australian Echinoderms: Biology, Ecology and Evolution. Csiro Publishing. pp. 191–192. ISBN 978-1-4863-0763-0.