Hyocrinida

Hyocrinida
	Hyocrinus sp.
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Crinoidea
Order:	Hyocrinida[1]
Synonyms[1]
	Hyocrinina

Hyocrinida is an order of sea lilies which contains a single extant family, Hyocrinidae.[1]

Characteristics

Members of this order have long slender stems consisting of a large number of identical columnar units. There are no cirri, and the basal disc of the stem attaches directly to the substrate. The calyx is globular or conical, and consists of five widely-spaced, undivided arms attached to five radial ossicles.[2]

Distribution

Hyocrinus cyanae

Most hyocrinids are found at depths below 700 m (2,300 ft), in the range 400 to 6,300 m (1,300 to 20,700 ft), in all the ocean basins and on seamounts.[2]

A hyocrinid observed off North Atlantic by the Okeanos Explorer program.

References

Messing, Charles (2013). "Hyocrinida". 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. 189–190. ISBN 978-1-4863-0763-0.

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[WoRMS-1] Messing, Charles (2013). "Hyocrinida". 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. 189–190. ISBN 978-1-4863-0763-0.