期刊
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
卷 163, 期 -, 页码 S37-S56出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1096-3642.2011.00713.x
关键词
Bauru Group; Baurusuchidae; Crocodyliformes; parasagittal gait; Theropoda
类别
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [APQ-00581-09]
- Fundacao Carlos Chagas de Amparo a Pesquisa do Rio de Janeiro (FAPERJ) [E-26/152.885/2006]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [486313/2006-9, 501267/2008-5]
The Baurusuchidae crocodyliforms are usually interpreted as active terrestrial predators, but only some positive evidence of such habits has been described to date, mainly the relative position of external nares and orbits. Here we describe features that support this view in a complete specimen of the Baurusuchidae Stratiotosuchus maxhechti, and have executed a parsimony analysis to confirm their phylogenetic position. S. maxhechti exhibits theropodomorph features that have been previously recognized in skulls of the Baurusuchidae, as well as postcranial characteristics related to a parasagittal gait, showing that the similarities between the Baurusuchidae and theropods extend beyond the cranial morphology. These include a well-developed supracetabular crest, a relatively medially offset femoral head and a caudally orientated calcaneal tuber. The orientations of the surfaces for muscular attachments imply that the appendicular movements of S. maxhechti were mainly anteroposterior, with abduction significantly constrained. S. maxhechti presents features that mimic some present in theropods, including a 'fossa brevis' on the ilium and tubercles on the ischium and femur similar to the obturator process and accessory trochanter. The relative proportions of the femur, tibia, and longer metatarsal are more similar to those of Postosuchus than to other Crocodylomorpha. In the skull, besides the theropodomorph (ziphodont) dentition concentrated in the anterior half of the rostrum, the baurusuchids are remarkable by the fusion of the nasals, which can be related to a large resistance against feeding forces acting on a high-profile skull. The appendicular morphology of S. maxhechti strengthens the interpretation that the Baurusuchidae were active land-dwelling predators in the Upper Cretaceous of south-eastern Brazil, occuping ecological niches typical of small to medium-sized theropod dinosaurs. (C) 2011 The Linnean Society of London, Zoological Journal of the Linnean Society, 2011, 163, S37-S56. doi: 10.1111/j.1096-3642.2011.00713.x
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据