| Isocrinida Temporal range:
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|---|---|
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| Isocrinus nicoleti columnals; Middle Jurassic; Carmel Formation; Utah. | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Crinoidea |
| Subclass: | Articulata |
| Order: | Isocrinida |
| Synonyms1 | |
|
Isocrinina Sieverts-Doreck, 1952 | |
Isocrinida is an order of sea lilies which contains four families.
Characteristics
Members of this order are characterised by having a "heteromorphic" stalk; the stalk consists of a series of nodes with cirri, interspersed by several nodes without cirri. There are additionally a whorl of cirri at the base on which the animal perches. The calyx is a shallow cup consisting of five basals and five radials.2
They are more mobile than other stalked crinoids, and can be found as shallow as 100–170 m (300–600 ft), and on rare occasions below 400 m (1,300 ft), but is most common at depths of 200–300 m (700–1,000 ft).3
Families
Ordo Isocrinida1
- Family Balanocrinidae Roux, 1981
- Subfamily Balanocrininae Roux, 1981
- Subfamily Diplocrininae Roux, 1981
- Subfamily Isselicrininae Klikushkin, 1977
- Subfamily Proisocrininae Rasmussen, 1978
- Family Cainocrinidae Simms, 1988
- Family Isocrinidae Gislén, 1924
- Subfamily Isocrininae Gislén, 1924
- Subfamily Metacrininae Klikushin, 1977
- Family †Pentacrinitidae Gray, 1842
- Subfamily Eocomatulinae Simms, 1988
- Subfamily Pentacrinitinae Blumenbach, 1804
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Isocrinus asteria -
Isocrinus fossil, Shamshak Formation, Alborz province, Iran -
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Endoxocrinus sp. (Balanocrinidae) -
Unidentified Isocrinid
References
References
- Marc Eleaume. "Isocrinida". WoRMS. World Register of Marine Species.
- O'Hara, Timothy; Byrne, Maria (2017). Australian Echinoderms: Biology, Ecology and Evolution. Csiro Publishing. p. 192. ISBN 978-1-4863-0763-0.
- Globally discordant Isocrinida (Crinoidea) migration confirms asynchronous Marine Mesozoic Revolution
- Hess H (2011) Isocrinida. In: Hess, H., Messing, C.G., Ausich, W.I. (Eds.), Treatise on Invertebrate Paleontology, Part T, Echinodermata 2 Revised, Crinoidea, vol. 3. University of Kansas Press, Lawrence, Kansas, pp. 42–69.