在Gomphodontia (Therapsida: Cynodontia) 中,狗后复杂性的演变
Christophe Hendrickx1,2, Fernando Abdala1,2, Florencia S Filippini3,4
1Unidad Ejecutora Lillo, CONICET-Fundación Miguel Lillo, San Miguel de Tucumán, Argentina.
Anatomical record (Hoboken, N.J. : 2007)
|January 29, 2024
概括
哥姆福顿特,早期的草食,随着时间的推移,进化了更简单的牙,与一些哺乳动物相反. 它们的牙复杂性很早就达到顶峰,然后随着草食而减少.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 哺乳动物进化 哺乳动物进化
背景情况:
- 哥姆福顿特是中期和三纪晚期占主导地位的类动物,以它们的食草动物适应和复杂的狗后牙而闻名.
- 他们是第一个开发hypsodonty和复杂的封闭模式的治疗虫之一.
研究的目的:
- 通过时间来研究 gomphodont cynodonts 牙复杂性的演变.
- 分析饮食,牙形态和 gomphodonts 的进化趋势之间的关系.
主要方法:
- 地理信息系统 (GIS) 分析和定向补丁计数 (OPC) 应用于 gomphodont postcanines 的 3D 冠面.
- 跨越三叠纪时期的32种哥姆福登特种类的牙复杂性的分析.
主要成果:
- 狗后复杂性峰值发生在三叠纪早期的食/食昆虫的食动物中,它们具有明显的尖端.
- 穿越类动物通过尖端凝聚和盆地发展进化了更简单的后犬,与增加的草食相关联.
- 杂食动物/昆虫动物的高度复杂性和食草动物的低复杂性的这种趋势与在一些现存的哺乳动物中观察到的趋势相反.
结论:
- 牙复杂性通常随着向草食的进化而减少.
- 在特里亚斯纪中期,狗后复杂性在穿越类动物中保持稳定,在特里亚斯纪晚期略有下降.
- 这项研究突出显示了三叠纪草食类类动物牙复杂性的独特进化轨迹.
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