A New Species of the Plagiaulacoid Multituberculate Mammal Eobaatar from the Early Cretaceous of Southern Britain
A New Species of the Plagiaulacoid Multituberculate Mammal Eobaatar from the Early Cretaceous of Southern Britain
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英国南部早白垩世斜角多瘤哺乳动物始巴托的新种
DOI：
10.4202/app.2008.0003
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Sweetman
中科院分区：
文献类型：
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作者：
S. Sweetman
直到最近，唯一的哺乳动物仍然是从早白垩世（Barremian，Wealden组）Wessex组的怀特岛，英格兰南部是一个保存较差的左m2和保存完好的左I2冠代表一个或两个可能的plagiaulacoid多瘤物种。这些化石在20世纪70年代初被发现，但尽管后来一些工人努力寻找更多的中生代哺乳动物遗骸，但直到2002年开始的一项研究中对威塞克斯组进行了全面的批量筛选，才发现了这些化石。这项研究的结果是恢复了一些新的标本，代表了至少六个分类群的组合。其中有一个保存完好的斜沟状多瘤左m1和一个类似的保存左I3。前者允许诊断的一个新的种eobaatarid，Eobaatar clemensi sp. nov.以前恢复的左m2也暂时分配到同一taxon.Also，另一个左m1，有点磨损作为饮食的磨损的结果，最近获得了私人收藏家。这与E. clemensi但稍大。这无疑是可归属于同一分类单元，并提供了一些深入了解种内大小，和其他微小的形态变化的牙齿的新物种。I3也可能与新物种相一致，在这种情况下，它是第一个保存完好的Eobaataridae成员的I3被完全描述。
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 I2 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 m1 and a similarly preserved left I3. 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 I3 may also be referable to the new species, in which case it is the first well preserved I3 of a member of Eobaataridae to be fully described.