Isocrinida
Order of crinoids
Isocrinida is an order of sea lilies which contains four families.
01Characteristics
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.
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).
02Families
Ordo Isocrinida
- 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
Sources and credits
This article is adapted from the Wikipedia article “Isocrinida”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Isocrinus nicoleti Kane County.JPG by Wilson44691, CC0
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