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首页> 外文期刊>Acta Palaeontologica Polonica >A new species of the plagiaulacoid multituberculate mammal Eobaatar from the Early Cretaceous of southern Britain
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A new species of the plagiaulacoid multituberculate mammal Eobaatar from the Early Cretaceous of southern Britain

机译：来自英国南部早白垩世的一种新的斑gia多结节哺乳动物Eobaatar

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摘要

Until recently, the only mammal remains to be obtained from the Early Cretaceous (Barremian, Wealden Group) Wessex Formation of the Isle of Wight, southern England were a poorly preserved left m2 and a well preserved left 12 crown representing one or possibly two plagiaulacoid multituberculate species. These were recovered in the early 1970s but despite subsequent efforts by a number of workers to recover additional Mesozoic mammal remains none were forthcoming until comprehensive bulk screening of the Wessex Formation was undertaken in a study commenced in 2002. This study resulted in the recovery of a number of new specimens representing an assemblage of at least six taxa. Among these are a well-preserved plagiaulacoid multituberculate left m I and a similarly preserved left 13. The former permits diagnosis of a new species of eobaatarid, Eobaatar clemensi sp. nov. The previously recovered left m2 is also tentatively assigned to the same taxon. In addition, another left m1, somewhat worn as a result of dietary attrition, was recently obtained by a private collector. This is of very similar morphology to the holotype of E. clemensi but slightly larger. It is undoubtedly referable to the same taxon and provides some insight into intraspecific size, and other minor morphological variations in the teeth of the new species. The 13 may also be referable to the new species, in which case it is the first well preserved 13 of a member of Eobaataridae to be fully described.
机译：直到最近，唯一的哺乳动物仍需从英格兰南部怀特岛的早白垩纪（巴里米亚，韦登集团）韦塞克斯形成中获得，其保留的m2左保存不佳，保留的12冠保留得很好，代表一个或两个斑节状多管状。种类。这些在1970年代初期得到了恢复，但是尽管一些工人随后进行了努力以恢复其他中生代哺乳动物的遗体，但直到2002年开始的一项研究对韦塞克斯地层进行全面的大块筛查之后，这些都没有得到解决。代表至少六个分类单元的新标本的数量。其中有一个保存完好的plagiaulacoid多结瘤左侧m I和一个同样保存完好的左侧13。前者允许诊断新的eobaatarid物种Eobaatar clemensi sp。十一月先前恢复的剩余m2也暂时分配给同一分类单元。此外，最近一位私人收藏家还发现了另一个左m1，由于饮食损耗而有些磨损。这与克雷伯氏大肠杆菌的全形非常相似，但是稍大。毫无疑问，它是指同一分类单元，并且可以洞悉种内大小以及新物种牙齿的其他微小形态变化。 13可能也指新物种，在这种情况下，它是完整描述的Eobaataridae成员的第一个保存完好的13。

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