Isocrinida
| Isocrinida Temporal range:
| |
|---|---|
| File:Isocrinus nicoleti Kane County.JPG | |
| Isocrinus nicoleti columnals; Middle Jurassic; Carmel Formation; Utah. | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Crinoidea |
| Subclass: | Articulata |
| Order: | Isocrinida |
| Synonyms[1] | |
|
Isocrinina Sieverts-Doreck, 1952 | |
Isocrinida is an order of sea lilies which contains four families.
Characteristics
[edit | edit source]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
[edit | edit source]Ordo Isocrinida[1]
- 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
-
Isocrinus fossil, Shamshak Formation, Alborz province, Iran
-
Endoxocrinus sp. (Balanocrinidae)
-
Unidentified Isocrinid
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ 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.
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