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
- 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 †
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
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