北美植物龙的牙釉质微结构:一个晚三叠世鳄鱼类食肉动物分支的生物地理学和生态学意义

IF 2 4区 地球科学 Q1 Earth and Planetary Sciences Palaeontologia Electronica Pub Date : 2021-01-01 DOI:10.26879/1162
Devin K. Hoffman, Jess Miller-Camp, A. Heckert
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引用次数: 3

摘要

牙齿可以为了解已灭绝脊椎动物的饮食和进化提供重要的信息。牙釉质微观结构记录了牙列大体形态之外的功能和系统发育信号。在这里,我们提供了植物龙牙釉质的第一个系统采样,以解决种内和种间变异的问题,从而分类鉴定,生物地理连通性和异源性。我们从美国西南部的五个地方和北卡罗来纳州纽瓦克超级群的一个地方取样了23颗植龙牙齿。这些牙齿可能代表5个异齿属,初步归属于Angistorhinus、Smilosu-chus、Machaeroprosopus、Redondasaurus和Rutiodon。我们用扫描电子显微镜从横向、纵向和切向的横截面上观察他们的牙釉质微观结构。所有取样的牙齿都由柱状牙釉质组成,厚度从20到150微米不等,通常为50-100微米
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Tooth enamel microstructure in North American Phytosauria (Diapsida:Archosauriformes): Implications for biogeography and ecology of a Late Triassic clade of crocodylian-like predators
Teeth can provide important insight into diet and evolution of extinct vertebrates. Tooth enamel microstructure records functional and phylogenetic signals beyond the gross morphology of the dentition. Here , we provide the first systematic sampling of phytosaur tooth enamel to address questions of intra-and interspecific variation, and thus taxonomic identification, biogeographic connectivity, and heterodonty. We sampled 23 phytosaur teeth from five localities throughout the American Southwest and one locality from the Newark Supergroup of North Carolina. These teeth probably represent five heterodont genera and are tentatively assigned to Angistorhinus, Smilosu-chus, Machaeroprosopus, Redondasaurus, and “Rutiodon” . We used scanning electron microscopy to examine their enamel microstructure from transverse, longitudinal, and tangential cross-sections. All sampled teeth are composed of columnar enamel ranging in thickness from 20 to 150 µm, typically 50–100 µm, across all
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来源期刊
Palaeontologia Electronica
Palaeontologia Electronica 地学-古生物学
CiteScore
3.60
自引率
0.00%
发文量
20
审稿时长
>12 weeks
期刊介绍: Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.
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