Programa de Pós-Graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Bairro Agronomia, Porto Alegre, Rio Grande do Sul, 91501-970, Brazil.
CONICET-Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, CABA, Argentina.
Sci Rep. 2024 Jun 15;14(1):13817. doi: 10.1038/s41598-024-64434-5.
The nasal cavity of living mammals is a unique structural complex among tetrapods, acquired along a series of major morphological transformations that occurred mainly during the Mesozoic Era, within the Synapsida clade. Particularly, non-mammaliaform cynodonts document several morphological changes in the skull, during the Triassic Period, that represent the first steps of the mammalian bauplan. We here explore the nasal cavity of five cynodont taxa, namely Thrinaxodon, Chiniquodon, Prozostrodon, Riograndia, and Brasilodon, in order to discuss the main changes within this skull region. We did not identify ossified turbinals in the nasal cavity of these taxa and if present, as non-ossified structures, they would not necessarily be associated with temperature control or the development of endothermy. We do, however, notice a complexification of the cartilage anchoring structures that divide the nasal cavity and separate it from the brain region in these forerunners of mammals.
生活在哺乳动物的鼻腔是一个独特的结构复杂的四足动物，获得沿一系列主要形态转变，主要发生在中生代，在合弓类分支。特别是，非哺乳形兽孔目动物记录了几个形态变化在头骨，在三叠纪，代表的第一步，哺乳动物bauplan。我们在这里探讨鼻腔的五个兽孔目 taxata，即 Thrinaxodon、Chiniquodon、Prozostrodon、Riograndia 和 Brasilodon，为了讨论的主要变化在这个头骨区域。我们没有识别出骨化鼻甲在鼻腔的这些 taxata，如果存在的话，作为非骨化结构，他们不一定与温度控制或发展的恒温。我们确实注意到一个复杂化的软骨锚固结构，划分鼻腔和分离它从脑区在这些哺乳动物的先驱。
