Isocrinida Sieverts-Doreck 1952

Isocrinida is an order of sea lilies which contains four extant 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.^[1]

Families

• Suborder Isocrinina Sieverts-Doreck, 1952
  • family Cainocrinidae Simms, 1988 -- 1 genus (1 species)
  • family Isocrinidae Gislén, 1924 -- 3 genus (3 species)
  • family Isselicrinidae Klikushkin, 1977 -- 4 genus (18 species)
  • family Proisocrinidae Rasmussen, 1978 -- 1 genus (1 species)
• Suborder Pentacrinitina Gray, 1842 †
  • family Pentacrinitidae Gray, 1842 †

• 

  Neocrinus decorus (Isocrinidae)

• 

  Metacrinus rotundus (Isselicrinidae)

• 

  Proisocrinus ruberrimus (Proisocrinidae)

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  Endoxocrinus sp.

• 

  Endoxocrinus parrae

• 

  Isocrinus asteria

References

• 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.