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A New Dicynodont (Therapsida: Anomodontia) from the Permian of Southern Brazil and Its Implications for Bidentalian Origins

机译:巴西南部二叠纪的一种新的齿齿龙(Therapsida:Anomodontia)及其对双齿动物起源的启示

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摘要

Dicynodonts were a highly successful group of herbivorous therapsids that inhabited terrestrial ecosystems from the Middle Permian through the end of the Triassic periods. Permian dicynodonts are extremely abundant in African deposits, but are comparatively poorly known from the other regions of Gondwana. Here we describe a new South American dicynodont, Rastodon procurvidens gen. et sp. nov., from the Boqueirão farm site of the Rio do Rasto Formation, Paraná Basin, Guadalupian/Lopingian of Brazil. Diagnostic features of R. procurvidens include uniquely anteriorly-curved maxillary tusks, well-developed ridges extending from the crista oesophagea anteriorly along the pterygoid rami, strong posterior angulation of the posterior pterygoid rami, and a bulbous, well-developed retroarticular process of the articular. Phylogenetic analysis indicates that R. procurvidens is the earliest and most basal member of Bidentalia, a cosmopolitan clade that includes Permian and Triassic dicynodonts whose dentition is usually reduced to a pair of maxillary tusks.
机译:犬齿龙是非常成功的食草类动物,其栖息于从中二叠纪到三叠纪末期的陆地生态系统。二叠纪犬齿龙在非洲的矿床中极为丰富,但在冈瓦纳其他地区却知之甚少。在这里,我们描述了一种新的南美双齿龙,Rastodon procurvidens gen。等。 11月,来自巴西瓜达卢比/洛平亚州Paraná盆地Rio do Rasto组的Boqueirão农场。 R. procurvidens的诊断特征包括独特的前弯上颌牙,从翼状cr肉向前沿翼状ra延伸的发达脊,后翼状ra的强后角以及球状,发达的关节后突。系统发育分析表明,R。procurvidens是Bidentalia的最早和最基础的成员,Bidentalia是一个国际化的分支,包括二叠纪和三叠纪的犬齿齿,它们的牙列通常减少为一对上颌illary牙。

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