Psittacosaurus amitabha, a New Species of Ceratopsian Dinosaur from the Ondai Sayr Locality, Central Mongolia

IF 1.1 3区环境科学与生态学 Q3 BIODIVERSITY CONSERVATION

American Museum Novitates Pub Date : 2019-07-25 DOI:10.1206/3932.1

James G. Napoli, Tyler C. Hunt, G. Erickson, M. Norell

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引用次数: 10

Abstract

ABSTRACT Psittacosaurus is the most speciose nonavian dinosaur genus, represented by at least 10 (and possibly as many as 19) species uncovered over a wide geographic range. Here, we report a new species of large-bodied Psittacosaurus from the Ondai Sayr locality in central Mongolia, which has hitherto produced only one other Psittacosaurus specimen. This new species is characterized by: (1) an elongate snout, with a gently inclined rostronasal margin, (2) a cranium dorsally convex rather than flat, (3) a subtemporal length less than 40% of total skull length, (4) a maxillary lamina that cups the posterior toothrow, (5) five premaxillary foramina arrayed in an arc, (6) an antorbital fossa as long as it is wide, and (7) a palpebral with a well-developed posterior tonguelike process. Psittacosaurus amitabha is resolved as the most basal member of the genus Psittacosaurus in our phylogenetic analysis. This taxon expands our knowledge of the already-speciose genus Psittacosaurus as well as our understanding of the Ondai Sayr fauna, which is poorly known in comparison to other Mongolian Early Cretaceous localities.

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阿米塔巴Psittacosaurus amitabha，蒙古中部Ondai-Sayr地区的一种新的角龙类恐龙

摘要Psittacosaurus是种类最多的非拉脱维亚恐龙属，在广泛的地理范围内发现了至少10种（可能多达19种）恐龙。在这里，我们报道了一种来自蒙古中部Ondai Sayr地区的大型Psittacosaurus新种，迄今为止，该物种只产生了另一个Psittacasaurus标本。这个新物种的特征是：（1）一个细长的吻部，有一个轻轻倾斜的头冠边缘，（2）颅骨背凸而非平坦，（3）颞下长度小于颅骨总长度的40%，（4）一个覆盖后牙列的上颌椎板，（5）五个排列成弧形的上颌前孔，（6）一个宽的眶内窝，和（7）具有发育良好的舌状后突的眼睑。在我们的系统发育分析中，amitabha鹦鹉龙被认为是鹦鹉龙属中最基础的成员。这个分类单元扩展了我们对已经物种化的Psittacosaurus属的了解，以及我们对Ondai Sayr动物群的了解，与其他蒙古早白垩世地区相比，Ondai Sayr动物区系鲜为人知。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

American Museum Novitates 环境科学-动物学

CiteScore

3.00

自引率

6.70%

发文量

审稿时长

>36 weeks

期刊介绍： The Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology.