Isocrinida

{{Short description|Order of crinoids}}

{{Automatic taxobox

| fossil_range = {{Fossil range|247|0|Anisian to Recent}}

| image = Isocrinus nicoleti Kane County.JPG

| image_caption = Isocrinus nicoleti columnals; Middle Jurassic; Carmel Formation; Utah.

| taxon = Isocrinida

}}

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.{{cite book|author1=O'Hara, Timothy|author2=Byrne, Maria|title=Australian Echinoderms: Biology, Ecology and Evolution |url=https://books.google.com/books?id=EtkqDwAAQBAJ&pg=PA192 |year=2017 |publisher=Csiro Publishing |isbn=978-1-4863-0763-0 |page=192}}

Families

Image:Neocrinus decorus.jpg|Neocrinus decorus (Isocrinidae)

Image:Metacrinus rotundus by OpenCage.JPG|Metacrinus rotundus (Isselicrinidae)

Image:Proisocrinus ruberrimus.jpg|Proisocrinus ruberrimus (Proisocrinidae)

Image:Endoxocrinus.jpg|Endoxocrinus sp.

Image:Endoxocrinus parrae.jpg|Endoxocrinus parrae

Image:Britannica Echinoderma 14.jpg|Isocrinus asteriaFile:Crinoid_fossils_the_Jurassic.jpg

References

{{Reflist}}

  • 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.

{{Taxonbar|from=Q15304495}}

{{Authority control}}

Category:Articulata (Crinoidea)

Category:Anisian first appearances

Category:Extant Middle Triassic first appearances

Category:Echinoderm orders

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