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首页> 外文期刊>Journal of Systematic Palaeontology >REASSESSMENT OF THE PHYLOGENETIC POSITION OF CONULARIIDS (?EDIACARAN-TRIASSIC) WITHIN THE SUBPHYLUM MEDUSOZOA (PHYLUM CNIDARIA)
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REASSESSMENT OF THE PHYLOGENETIC POSITION OF CONULARIIDS (?EDIACARAN-TRIASSIC) WITHIN THE SUBPHYLUM MEDUSOZOA (PHYLUM CNIDARIA)

机译：估测介子下甲虫（中华LUM）中的UL虫（？乙二胺-三叠纪）的系统发育位置

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摘要

Fossil taxa of uncertain phylogenetic affinities can play a crucial role in the analysis of character evolution within major extant groups. Marques & Collins (2004) concluded that conu-lariids (?Ediacaran-Triassic) are an extinct group of medusozoan cnidarians most closely related to Stauromedusae. However, only six of the 87 characters used by these authors can be observed in conulariid fossils. Rescoring the character states of conulariids in a conservative manner yields a new hypothesis for the phylogenetic position of conulariids, namely that they are the sister group of the scyphozoan order Coronatae rather than Stauromedusae, which is revealed as the earliest diverging lineage of Medusozoa. This new hypothesis also implies several different sequences of character evolution within Cnidaria. Specifically, the presence of a periderm completely covering the polyp in conulariids and coronates appears to be derived within Scyphozoa. Strobilation appears to be a synapomorphy uniting conulariids, Coronatae, Rhizostomeae and Semaeostomeae. This result supports the controversial interpretation of one exceptionally preserved conulariid that potentially shows that these animals produced ephyrae by Strobilation. Finally, the pelagic adult medusa stage and the giant fibre nerve net appear to be features that are derived within Medusozoa.
机译：系统发育亲和力不确定的化石类群在主要现存群体的性状进化分析中可以发挥关键作用。 Marques＆Collins（2004）得出结论，类疣（？Ediacaran-Triassic）是灭绝的中型梭子蟹，与Stauromedusae密切相关。但是，在椭圆形化石中只能观察到这些作者使用的87个字符中的六个。以保守的方式核对球果的性状产生了关于球果的系统发生位置的新假说，即它们是海豚科的冠状花科而不是门尾科的姊妹群，这被认为是美杜鹃的最早分化谱系。这个新的假设也暗示了刺胞草内字符进化的几个不同序列。具体而言，在鞘脂虫中似乎存在完全覆盖息肉的鞘皮和冠状体的皮层。疏忽似乎是一个将突触体，冠状花科，根茎科和Semaeostomeae联合的突触。这一结果支持了对一种特殊保存的卵白质的有争议的解释，它可能表明这些动物是通过Strobilation产生了e。最后，中上层的成年美杜莎阶段和巨大的纤维神经网似乎是在美杜莎内获得的特征。

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