{{Short description|Order in the class Pterobranchia in the phylum Hemichordata}} {{Automatic taxobox | fossil_range={{Geological range|506.5|0|Cambrian (Wuliuan)–Present<ref name=Treatise/>}} | image = Cephalodiscus dodecalophus McIntosh.png | image_caption = ''Cephalodiscus dodecalophus'' | taxon = Cephalodiscida | authority = Fowler, 1892 | subdivision_ranks = Families | subdivision = * Cephalodiscidae <small>Harmer, 1905</small> * †Rotaciurcidae <small>Briggs & Koch, 2023</small> | synonyms = * Cephalodiscoidea <small>Beklemishev, 1951</small> }}
'''Cephalodiscida''' is one of two orders in the class Pterobranchia, which are small, worm-shaped animals. Members belong to the hemichordates.<ref name=animaldiversity/><ref name=eol/> Species in this order are sessile, living in clear water and secrete tubes on the ocean floor.<ref name=Shipley1902/>
==Taxonomy== The following taxa are recognised in the order Cephalodiscida:<ref name=Treatise/><ref name=Maletz2014/><ref name=BriggsKoch2023/>
* '''Order Cephalodiscida''' <small>Fowler, 1892</small> ** '''Family Cephalodiscidae''' <small>Harmer, 1905</small> *** Genus ''Atubaria'' <small>Sato, 1936</small> *** Genus ''Cephalodiscus'' <small>M'Intosh, 1882</small> *** Genus †''Aellograptus'' <small>Obut, 1964</small> *** Genus †''Eocephalodiscus'' <small>Kozłowski, 1949</small> *** Genus †''Melanostrophus'' <small>Öpik, 1930</small> *** Genus †''Pterobranchites'' <small>Kozłowski, 1967</small> ** '''Family †Rotaciurcidae''' <small>Briggs & Koch, 2023</small><ref name=BriggsKoch2023/> *** Genus †''Rotaciurca'' <small>Briggs & Koch 2023</small><ref name=BriggsKoch2023/>
==References== <references>
<ref name=Treatise>{{Cite journal |last=Maletz |first=Jörg |last2=Gonzalez |first2=Paul |date=2017-02-15 |title=Treatise Online no. 100: Part V, Second Revision, Chapter 14: Order Cephalodiscida: Introduction and systematic descriptions |url=https://journals.ku.edu/treatiseonline/article/view/6674 |journal=Treatise Online |language=en |doi=10.17161/to.v0i0.6674 |issn=2153-4012}}</ref>
<ref name=Maletz2014>{{cite journal |last=Maletz |first=Jörg| title=The classification of the Pterobranchia (Cephalodiscida and Graptolithina) |journal=Bulletin of Geosciences |year=2014 |volume=89 |issue=3 |pages=477–540 |doi=10.3140/bull.geosci.1465 |issn=1214-1119|doi-access=free }}</ref>
<ref name=animaldiversity>[http://animaldiversity.ummz.umich.edu/site/accounts/classification/Cephalodiscida.html animaldiversity.ummz.umich.edu] {{webarchive |url=https://web.archive.org/web/20110629051029/http://animaldiversity.ummz.umich.edu/site/accounts/classification/Cephalodiscida.html |date=June 29, 2011 }}</ref>
<ref name=eol>[http://www.eol.org/pages/8855 Eol.org]</ref>
<ref name=Shipley1902>Shipley, A.E. (1902). Zoology: An Elementary Textbook. Cambridge: Cambridge University Press.</ref>
<ref name=BriggsKoch2023>{{Cite journal |last=Briggs |first=Derek E. G. |last2=Koch |first2=Nicolás Mongiardino |date=2023-12-04 |title=A Silurian pseudocolonial pterobranch |url=https://www.cell.com/current-biology/abstract/S0960-9822(23)01410-0 |journal=Current Biology |language=English |volume=33 |issue=23 |pages=5225–5232.e3 |doi=10.1016/j.cub.2023.10.024 |issn=0960-9822 |pmid=37935193}}</ref>
</references>
== Further reading == {{ref begin}}
* {{cite journal|last=Harmer|first=S. F.|date=1905|title=The Pterobranchia of the Siboga-expedition with an account of other species|journal=Siboga Expedition Monograph|volume=26|pages=1–131}}
*{{Cite journal|last=Halanych|first=K. M.|date=1996-02-01|title=Convergence in the Feeding Apparatuses of Lophophorates and Pterobranch Hemichordates Revealed by 18S rDNA: An Interpretation|url=https://www.journals.uchicago.edu/doi/10.2307/1542669|journal=The Biological Bulletin|volume=190|issue=1|pages=1–5|doi=10.2307/1542669|issn=0006-3185|url-access=subscription}}
{{ref end}}
{{Wikispecies}} {{Taxonbar|from1=Q5063285|from2=Q18485081}}
Category:Pterobranchia Category:Bilateria orders
{{Hemichordate-stub}}