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Morphology of the endocranial cavities of Campinasuchus dinizi (Crocodyliformes: Baurusuchidae) from the Upper Cretaceous of Brazil
Geobios ( IF 1.6 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.geobios.2019.11.001
Pedro Henrique Morais Fonseca , Agustín Guillermo Martinelli , Thiago da Silva Marinho , Luiz Carlos Borges Ribeiro , Cesar Leandro Schultz , Marina Bento Soares

Abstract Two specimens of Campinasuchus dinizi (CPPLIP 1319 and CPPLIP 1360) belonging to Baurusuchidae (Crocodyliformes, Notosuchia) from the Upper Cretaceous Bauru Group of Minas Gerais state (Brazil) were scanned in a Toshiba Aquilion 64 CT machine. Based on these data, it was possible to identify and reconstruct the paranasal sinuses, the nasal cavity proper, the nasopharyngeal duct, the encephalon, the paratympanic sinuses, and the semicircular canals of the inner ear. The paranasal sinuses present similar morphology to those of other mesoeucrocodylians, especially eusuchians. The nasal cavity proper occupies the entire rostral region, with an expansion in the olfactory region. The expansion in the nasal cavity is present in other notosuchians and theropod dinosaurs (e.g., Tyrannosaurus rex Osborn, 1905), but less developed in aquatic crocodilians, which may indicate an olfactory acuity related to terrestrial habits. The encephalon is similar in shape to that of other mesoeucrocodylians. The rostral semicircular canal is smaller than the caudal one, differing from most mesoeucrocodylians. The paratympanic sinuses are more developed in C. dinizi than in eusuchians, being more similar to Tyrannosaurus rex. Campinasuchus dinizi presents few variations in the internal structures of the skull in relation to taxa with different ecological niches, probably indicating that ecological factors do not strongly influence the morphology of these structures.

中文翻译:

巴西上白垩统Campinasuchus dinizi (Crocodyliformes: Baurusuchidae) 颅腔形态

摘要 在东芝 Aquilion 64 CT 机器上扫描了来自巴西米纳斯吉拉斯州上白垩统包鲁群的包鲁鳄科 (Crocodyliformes, Notosuchia) 的两个 Campinasuchus dinizi (CPPLIP 1319 和 CPPLIP 1360) 标本。基于这些数据,可以识别和重建鼻旁窦、鼻腔本身、鼻咽管、脑、副鼓室和内耳的半规管。鼻旁窦的形态与其他中鳄类动物,尤其是真鳄类动物的形态相似。鼻腔本身占据整个嘴部区域,在嗅觉区域扩张。鼻腔的扩张也存在于其他棘爪龙和兽脚亚目恐龙中(例如霸王龙奥斯本,1905),但在水生鳄鱼中较不发达,这可能表明与陆地习惯有关的嗅觉敏锐度。脑的形状与其他中鳄鱼的脑相似。喙半规管比尾半规管小,这与大多数中鳄鱼不同。C. dinizi 的副鼓室窦比eusuchians 更发达,更类似于霸王龙。Campinasuchus dinizi 与具有不同生态位的分类群相关的头骨内部结构几乎没有变化,这可能表明生态因素不会强烈影响这些结构的形态。喙半规管比尾半规管小,这与大多数中鳄鱼不同。C. dinizi 的副鼓室窦比eusuchians 更发达,更类似于霸王龙。Campinasuchus dinizi 与具有不同生态位的分类群相关的头骨内部结构几乎没有变化,这可能表明生态因素不会强烈影响这些结构的形态。喙半规管比尾半规管小,这与大多数中鳄鱼不同。C. dinizi 的副鼓室窦比eusuchians 更发达,更类似于霸王龙。Campinasuchus dinizi 与具有不同生态位的分类群相关的头骨内部结构几乎没有变化,这可能表明生态因素不会强烈影响这些结构的形态。
更新日期:2020-02-01
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