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首页> 外文期刊>Journal of Systematic Palaeontology >The first coleoid cephalopods from the Upper Cenomanian of Sicily (Italy) and their implications for the systematic-phylogenetic position of the Palaeololiginidae (Teudopseina)
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The first coleoid cephalopods from the Upper Cenomanian of Sicily (Italy) and their implications for the systematic-phylogenetic position of the Palaeololiginidae (Teudopseina)

机译：来自西西里岛上西诺曼尼亚（意大利）的第一个类脂头足类动物及其对古e科（Teudopseina）的系统发育位置的影响

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摘要

Our knowledge about the evolutionary history of coleoid cephalopods is mainly based on a few evolutionary windows. In particular, palaeogeographical data is strongly limited; every new fossil locality yielding coleoid remains is therefore of exceptional interest. Here, we describe the first coleoids from the Upper Cenomanian of Sicily (southern Italy). The material includes two fragmentary gladii, identified as Marekites nebrodensis sp. nov. and Rachiteuthis? sp. These two related taxa from the north-western Mediterranean region differ from most of their contemporaries in the south-eastern Mediterranean Lebanon fauna. Owing to their lanceolate posterior gladius, both taxa are classified as members of the Palaeololiginidae, a previously poorly defined family of Mesozoic gladius-bearing octobrachians. In the light of our observations, the family can now be characterized by its very gently arcuate hyperbolar zone, as well as the occurrence of a constriction of the median field. Marekites nebrodensis sp. nov. confirms that Cretaceous palaeololiginids share a relatively longer free (rachis-like) median field than their Jurassic forerunner Palaeololigo. Besides systematic-morphological implications, the higher level phylogenetic position of Paleololiginidae is discussed. In this context, we reject the idea of Palaeololiginidae as early bathyteuthoid decabrachians.
机译：我们对类头足类动物进化史的认识主要基于几个进化窗口。特别是，古地理数据受到严格限制；因此，每一个新的化石产地产生的类固醇残留物都会引起人们极大的兴趣。在这里，我们描述了西西里岛上南西诺马尼亚（意大利南部）的第一个类胚体。该物质包括两个片段状的剑兰，被鉴定为Marekites nebrodensis sp。十一月和Rachiteuthis？ sp。来自地中海西北部地区的这两个相关的分类单元不同于它们在地中海东南部黎巴嫩动物区系中的大多数同期生物。由于它们的后方披针形，这两个分类单元都被归为古豹科的成员，古豹科以前是定义不清的中生熊掌八足动物家族。根据我们的观察，该家庭现在可以以其非常柔和的弧形双曲线带以及中场收缩的特征为特征。 Marekites nebrodensis sp。十一月证实白垩纪古古生物类比其侏罗纪先祖古古猿类拥有相对更长的自由（轴）样中位场。除了系统形态学意义外，还讨论了古古猿科的较高系统发育位置。在这种情况下，我们拒绝将古龟科称为早期的拟贝类的十足动物。

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