刺胞動物門:修订间差异

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近期的[[系统发生学]]分析支持刺胞動物是一個[[单系群]],而且與[[两侧对称动物]]是[[旁系群]]關係<ref>{{cite journal |vauthors=Zapata F, Goetz FE, Smith SA, Howison M, Siebert S, Church SH, etal| title=Phylogenomic Analyses Support Traditional Relationships within Cnidaria. | journal= PLOS ONE | volume=10| issue=10| year=2015| pages=e0139068| doi=10.1371/journal.pone.0139068 | pmid=26465609 | pmc=4605497| bibcode=2015PLoSO..1039068Z}}</ref>。在大約5.8億年前形成的岩石中發現了刺胞動物的化石,其他化石表明珊瑚可能在4.9億年前左右才出現,並在幾百萬年後出現多樣化。然而,[[線粒體]]基因的{{tsl|en|molecular clock|分子鐘|molecular clock}}分析表明,{{tsl|en|crown group||crown group}}的年齡要大得多,估計大約有7.41億年前,在寒武紀以至任何化石出現的時期還要早2億年<ref>{{cite journal |vauthors=Park E, Hwang D, Lee J, Song J, Seo T, Won Y | title=Estimation of divergence times in cnidarian evolution based on mitochondrial protein-coding genes and the fossil record. | journal= Molecular Phylogenetics & Evolution | volume=62| issue=1| date=2012-01 | pages=329–45 | doi=10.1016/j.ympev.2011.10.008 | pmid = 22040765 }}</ref>。
 
===Family tree分支樹===
{{further information|Phylogeny系统发生学}}
<div style="float:right; width:auto; border:solid 1px silver; padding:2px; margin:2px; font-size:90%">
<div style="width:auto; border:solid 1px silver; padding:5px">
{{clade
|label1=<!-- [[Metazoa]] -->[[动物]]
|1={{clade
|1=<!-- [[Glass sponge]] -->[[六放海绵纲]]s
|2={{clade
|1=<!-- [[Demosponge寻常海绵纲]] -->[[寻常海绵纲Demosponge]]s
|2={{clade
|1=<!-- [[Calcarea|Calcareous sponges]] -->[[钙质海绵纲]]
|2={{clade
|1={{link-en|Homoscleromorpha|Homoscleromorpha}}
|label2=<!-- [[Eumetazoa]] -->[[真后生动物]]
|2={{clade
|1=<!-- [[Ctenophora栉水母]] -->[[栉水母Ctenophora]] (comb jellies)
|label2={{link-en|ParaHoxozoa|ParaHoxozoa}}
|2={{clade
|1=<!-- [[Placozoa]] -->[[扁盘动物门]] [[Placozoa]]
|label2={{link-en|Planulozoa|Planulozoa}}
|2={{clade
|label1='''Cnidaria'''