Isocrinida

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Isocrinida
Temporal range: Anisian to Recent
Isocrinus nicoleti Kane County.JPG
Isocrinus nicoleti columnals; Middle Jurassic; Carmel Formation; Utah.
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
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.

Contents

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]

Families

Ordo Isocrinida [1]

References

  1. 1 2 Marc Eleaume. "Isocrinida". WoRMS. World Register of Marine Species.
  2. O'Hara, Timothy; Byrne, Maria (2017). Australian Echinoderms: Biology, Ecology and Evolution. Csiro Publishing. p. 192. ISBN   978-1-4863-0763-0.