{{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 | synonyms = Isocrinina <small>Sieverts-Doreck, 1952</small> | synonyms_ref = <ref name=WoRMS/> }}
'''Isocrinida''' is an order of '''sea lilies''' which contains four families.
==Characteristics== {{Main|Crinoid#Morphology}} 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.<ref name=OHara>{{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}}</ref>
They are more mobile than other stalked crinoids, and can be found as shallow as {{convert|100–170|m|ft|-2|abbr=on}}, and on rare occasions below {{convert|400|m|ft|-2|abbr=on}}, but is most common at depths of {{convert|200–300|m|ft|-2|abbr=on}}.<ref>[https://www.nature.com/articles/s42003-018-0048-0 Globally discordant Isocrinida (Crinoidea) migration confirms asynchronous Marine Mesozoic Revolution]</ref>
==Families== Ordo '''Isocrinida'''<ref name=WoRMS>{{Cite WoRMS|author=Marc Eleaume|id=123095|title=Isocrinida}}</ref> * Family Balanocrinidae <small>Roux, 1981</small> ** Subfamily Balanocrininae <small>Roux, 1981</small> ** Subfamily Diplocrininae <small>Roux, 1981</small> ** Subfamily Isselicrininae <small>Klikushkin, 1977</small> ** Subfamily Proisocrininae <small>Rasmussen, 1978</small> * Family Cainocrinidae <small>Simms, 1988</small> * Family Isocrinidae <small>Gislén, 1924</small> ** Subfamily Isocrininae <small>Gislén, 1924</small> ** Subfamily Metacrininae <small>Klikushin, 1977</small> * Family {{Extinct}}Pentacrinitidae <small>Gray, 1842</small> ** Subfamily Eocomatulinae<!--Monotypic subfamily--> <small>Simms, 1988</small> ** Subfamily Pentacrinitinae <small>Blumenbach, 1804</small>
<gallery style="text-align:center;" widths=200 mode="nolines"> Image:Endoxocrinus parrae.jpg|''Endoxocrinus parrae'' (Balanocrinidae) Image:Britannica Echinoderma 14.jpg|''Isocrinus asteria'' File:Crinoid_fossils_the_Jurassic.jpg|''Isocrinus'' fossil, Shamshak Formation, Alborz province, Iran Image:Metacrinus rotundus by OpenCage.JPG|''Metacrinus rotundus'' (Isocrinidae) Image:Neocrinus decorus.jpg|''Neocrinus decorus'' (Balanocrinidae) Image:Proisocrinus ruberrimus.jpg|''Proisocrinus ruberrimus'' (Balanocrinidae) Image:Endoxocrinus.jpg|''Endoxocrinus sp.'' (Balanocrinidae) File:Crinoide vraie.jpg|Unidentified Isocrinid </gallery>
==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:Isocrinida Category:Articulata (Crinoidea) Category:Anisian first appearances Category:Extant Middle Triassic first appearances Category:Echinoderm orders
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