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Cranial osteology of the theropod dinosaur incisivosaurus gauthieri (Theropoda: Oviraptorosauria)

机译:兽脚亚目恐龙门齿龙的颅骨学(兽脚亚目:卵形龙)

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摘要

We provide a description of the holotype skull of the unusual oviraptorosaur Incisivosaurus gauthieri. Previous phylogenetic analyses have placed this taxon firmly within Oviraptorosauria near the base of the clade; however, until now only a cursory description of this important specimen was available. The presence of many primitive characteristics (e.g., maxillary and dentary teeth as well as an extended palate and rostrum) indicates that the observed similarities between avians and derived oviraptorids are convergences rather than shared derived characters. In addition, we clarify previous descriptions of several ambiguous anatomical features, most notably of the palate. We also employ computed tomographic (CT) analysis, which allows for a more complete description of the braincase and the reconstruction of an endocranial endocast. CT imagery reveals features that were before unobtainable, such as the presence of a replacement tooth behind the large rodentiform incisor in the premaxilla. This arrangement indicates that although the incisiform teeth of I. gauthieri are morphologically distinct they are replaced in typical archosaurian fashion.
机译:我们提供了不寻常的食齿龙门齿龙的全型头骨的描述。先前的系统发育分析已经将该分类群牢固地置于进化枝基部附近的卵小龙虾体内。然而,直到现在,对这一重要标本的粗略描述仍然可用。存在许多原始特征(例如上颌和齿齿以及上颚和讲台延伸)表明,禽类和衍生的卵母动物之间观察到的相似性是收敛的,而不是共有的衍生特征。另外,我们澄清了先前对几种模棱两可的解剖特征的描述,最明显的是对上颚的描述。我们还使用计算机断层扫描(CT)分析,该分析可以对大脑病例进行更完整的描述,并可以对颅内膜内铸物进行重建。 CT图像显示了以前无法获得的特征,例如上颌前大啮齿状门齿后方存在替换牙齿。这种排列表明,尽管高加索犬齿的锯齿在形态上是截然不同的,但它们却以典型的考古龙方式被替换。

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