Evers Serjoscha W, Foth Christian, Rauhut Oliver W M
Department of Geosciences, University of Fribourg, Fribourg, Switzerland.
Bayerische Staatssammlung für Paläntologie und Geologie, Staatliche Naturwissenschaftliche Sammlungen Bayerns (SNSB), München, Germany.
PeerJ. 2020 Feb 7;8:e8493. doi: 10.7717/peerj.8493. eCollection 2020.
, from the Late Jurassic of North America and Europe, is a model taxon for Jurassic basal tetanuran theropod dinosaurs. It has achieved an almost iconic status due to its early discovery in the late, 19th century, and due to the abundance of material from the Morrison Formation of the western U.S.A., making one of the best-known theropod taxa. Despite this, various aspects of the cranial anatomy of are surprisingly poorly understood. Here, we discuss the osteology of the cheek region, comprised by the jugal, maxilla, and lacrimal. This region of the skull is of importance for taxonomy and phylogeny, particularly because has traditionally been reconstructed with an unusual cheek configuration, and because the European species has been said to be different from North American material in the configuration of these bones. Based on re-examination of articulated and disarticulated material from a number of repositories, we show that the jugal participates in the antorbital fenestra, contradicting the common interpretation. The jugal laterally overlies the lacrimal, and forms an extended antorbital fossa with this bone. Furthermore, we document previously unrecorded pneumatic features of the jugal of .
来自北美和欧洲晚侏罗世的[具体物种名称未给出]，是侏罗纪基础坚尾龙类兽脚亚目恐龙的一个典型分类单元。由于它在19世纪晚期被早期发现，以及来自美国西部莫里森组的丰富化石材料，它已获得了近乎标志性的地位，成为最著名的兽脚亚目分类单元之一。尽管如此，[具体物种名称未给出]颅骨解剖学的各个方面却令人惊讶地知之甚少。在这里，我们讨论由颧骨、上颌骨和泪骨组成的脸颊区域的骨骼学。颅骨的这个区域对于[具体物种名称未给出]的分类学和系统发育很重要，特别是因为[具体物种名称未给出]传统上被重建为具有不寻常的脸颊结构，并且因为欧洲物种[具体物种名称未给出]据说在这些骨骼的结构上与北美材料不同。基于对来自多个收藏库的关节连接和分离的材料的重新检查，我们表明颧骨参与眶前孔的构成，这与通常的解释相矛盾。颧骨在侧面覆盖泪骨，并与这块骨头形成一个延伸的眶前窝。此外，我们记录了[具体物种名称未给出]颧骨以前未记录的气腔特征。
