On Mesozoic laetmogonid sea cucumbers (Echinodermata: Holothuroidea: Elasipodida)*

On Mesozoic laetmogonid sea cucumbers (Echinodermata: Holothuroidea: Elasipodida)*
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中生代海参(棘皮动物门:海参总科:Elasipodida)*

DOI:
10.11646/zoosymposia.7.1.18
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发表时间:
2012
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本文对中生代海参及其近缘种的化石进行了比较系统的调查。对化石记录的重新检查表明,只有13个化石分类群可以被认为属于这个群体。另外四个已知的“laetmogonid”分类群可被视为inintertae sedis。对结果的分析支持以下分类变化。古ocaudinidae Boczarowski, 2001代表了Laetmogonidae Ekman, 1926的初级同义词。Staurocaudininae Boczarowski亚科,1997仅限于Staurocaudina的模式种。新家族古淋虫科可能包括淋虫科茎组成员。在欧洲晚白垩世沉积物中发现了3个新种(Palaeocaudina rugia, priscolaetmogo oloughlini, palaeolaetmogo frankwiesei)。建立了两个新属(Palaeolaetmogone, Priscolaetmogone)。分析和讨论了中、新生代巨卵目巨卵目的地理分布和系统发育关系。
A comparative systematic survey of fossil Mesozoic laetmogonid sea cucumbers (Elasipodida) and their relatives is presented. A re-examination of the fossil record shows that only 13 fossil taxa can be recognised as belonging to this group. Four further known ‘laetmogonid’taxa can be regarded as incertae sedis. An analysis of the results supports the following taxonomic changes. Palaeocaudinidae Boczarowski, 2001 represents a junior synonym of the Laetmogonidae Ekman, 1926. The subfamily Staurocaudininae Boczarowski, 1997 is restricted to the type species of Staurocaudina. The new family Palaeolaetmogonidae comprises probable stem group members of the Laetmogonidae. Three new species (Palaeocaudina rugia, Priscolaetmogone oloughlini, Palaeolaetmogone frankwiesei) are described from Late Cretaceous sediments of Europe. Two new genera (Palaeolaetmogone, Priscolaetmogone) are erected. The geographic distribution and phylogenetic relationships of Mesozoic and Cenozoic laetmogonid holothurians are analysed and discussed.
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