Isocrinida Temporal range:
| |
---|---|
Isocrinus nicoleti columnals; Middle Jurassic; Carmel Formation; Utah. | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Class: | Crinoidea |
Subclass: | Articulata |
Order: | Isocrinida |
Isocrinida is an order of sea lilies which contains four extant families.
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.[1]