Phylogenetic relationships of Palaeogene ziphodont eusuchians and the status of Pristichampsus Gervais, 1853
Phylogenetic relationships of Palaeogene ziphodont eusuchians and the status of Pristichampsus Gervais, 1853
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DOI：
10.1017/s1755691013000200
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发表时间：
2012-09-01
影响因子：
1.2
通讯作者：
Brochu, Christopher A.
中科院分区：
文献类型：
--
作者：
Brochu, Christopher A.
长着深鼻子和唇舌压扁牙齿的优胜者是劳拉西亚古近纪的已知物种。这些通常指的是Pristichampsinae，但模式种，Pristichampsus rolinati，是基于不充分的诊断材料，并且应该被视为一个无名。至少有两种以前被称为Pristichampsus的Lutetian物种可以在德国和欧洲其他地方被识别为Boverisuchus magifrons，以及在北美西部的Boverisuchus vorax，这是新的组合。来自意大利和德克萨斯州始新世中期的物质可能代表了不同的物种。系统发育分析证实了它们之间的亲缘关系，并支持它们与两个亚洲亚型--早始新世大唐原盘藻和古新世横东原盘藻的关系。这个群的名字叫李1976，是属于这个群的。一个独特的方形，在内侧和外侧半髁之间有一个突出的背峰，仅在Boverisuchus中已知，虽然Plancrania的牙齿是扁平的，但它们没有锯齿。爬行动物作为鳄鱼总科+鳄鱼总科的姊妹群保持着系统发育的地位，但这部分树是不稳定的，发现更古老、更原始的爬行动物将有助于解决现存鳄鱼血统系统发育关系上的冲突。
Eusuchians with deep snouts and labiolingually compressed teeth are known from the Palaeogene of Laurasia. These are usually referred to Pristichampsinae, but the type species, Pristichampsus rollinati, is based on insufficiently diagnostic material and should be treated as a nomen dubium. At least two Lutetian species formerly referred to Pristichampsus can be recognised Boverisuchus magnifrons in Germany and possibly elsewhere in Europe, and Boverisuchus vorax, new combination, in western North America. Material from the middle Eocene of Italy and Texas may represent distinct species. A phylogenetic analysis confirms their close relationship and also supports a relationship with two Asian forms - early Eocene Planocrania datangensis and Palaeocene Planocrania hengdongensis. The name Planocraniidae Li 1976 is applied to this group. A distinctive quadrate with a prominent dorsal peak between medial and lateral hemicondyles is known only in Boverisuchus, and although the teeth of Planocrania are flattened, they are not serrated. Planocraniids maintain a phylogenetic position as the sister group to Crocodyloidea + Alligatoroidea, but this part of the tree is unstable and discovery of older, more primitive planocraniids will help resolve conflicts on the phylogenetic relationships of extant crocodylian lineages.