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(Top)
 


1 Phylogeny  





2 References  





3 External links  














Hexacorallia






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Hexacorallia
Temporal range: Fortunian–Present[1]

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A stony coral, Acropora latistella
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Cnidaria
Subphylum: Anthozoa
Class: Hexacorallia
Haeckel, 1896
Orders

See text.

Aspidiscus cristatus from the Cenomanian (Upper Cretaceous) of southern Israel; oral view.
Aspidiscus cristatus from the Cenomanian (Upper Cretaceous) of southern Israel; aboral view.

Hexacorallia is a classofAnthozoa comprising approximately 4,300 species of aquatic organisms formed of polyps, generally with 6-fold symmetry. It includes all of the stony corals, most of which are colonial and reef-forming, as well as all sea anemones, and zoanthids, arranged within five extant orders.[2] The hexacorallia are distinguished from another class of Anthozoa, Octocorallia, in having six or fewer axes of symmetry in their body structure; the tentacles are simple and unbranched and normally number more than eight.[3] These organisms are formed of individual soft polyps which in some species live in colonies and can secrete a calcite skeleton. As with all Cnidarians, these organisms have a complex life cycle including a motile planktonic phase and a later characteristic sessile phase. Hexacorallia also include the significant extinct order of rugose corals.

Phylogeny

[edit]

Hexacorallia is considered to be monophyletic, that is all contained species are descended from a common ancestor, however it has been suggested that many of the current orders are not. Historically, Antipatharia was considered to be in a separate class called Ceriantipatharia, though more recent genetic studies place it in Hexacorallia.[2]

The class includes important coral reef builders such as the stony corals, sea anemones, and zoanthids. The recognized orders are shown below:[4]

References

[edit]
  1. ^ Han, Jian; Kubota, Shin; Uchida, Hiro-omi; Stanley Jr., George D.; Yao, Xiaoyong; Shu, Degan; Li, Yong; Yasui, Kinya (October 13, 2010). "Tiny Sea Anemone from the Lower Cambrian of China". PLOS One. 5 (10): e13276. Bibcode:2010PLoSO...513276H. doi:10.1371/journal.pone.0013276. PMC 2954142. PMID 20967244.
  • ^ a b Daly, M.; Brugler, M.P.; Cartwright, P.; Collins, A.G.; Dawson, M.N.; Fautin, D.G.; France, S.C.; McFadden, C.S.; Opresko, D.M.; Rogriguez, E.; Romano, S.L.; Stake, J.L. (2007-07-21). "The phylum Cnidaria: A review of phylogenetic patterns and diversity 300 years after Linnaeus". Zootaxa. 1668: 1–766. doi:10.11646/zootaxa.1668.1.11. hdl:1808/13641. ISSN 1175-5326.
  • ^ Light. Sol Felty (2007). The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon. University of California Press. p. 177. ISBN 978-0-520-23939-5.
  • ^ "WoRMS - World Register of Marine Species - Hexacorallia". marinespecies.org. Retrieved 2018-04-03.
  • [edit]
    Retrieved from "https://en.wikipedia.org/w/index.php?title=Hexacorallia&oldid=1224370654"

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    This page was last edited on 18 May 2024, at 00:26 (UTC).

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