复杂的牙磨损分析揭示了三叠纪 placodonts (Sauropsida,Sauropterygia) 的饮食转变
Kinga Gere1, András Lajos Nagy2, Torsten M Scheyer3
1Institute of Geography and Earth Sciences, Department of Paleontology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, 1117 Budapest, Hungary.
Swiss journal of palaeontology
|February 8, 2024
概括
三叠纪的海爬行动物,呈现出明显的牙磨损模式,表明它们的饮食多样化. 分析表明,一些 placodonts 混合饮食,而不仅仅是硬食物,Henodus 可能消耗植物.
科学领域:
- 古生物学的古生物学
- 海洋爬行动物的进化
- 特里亚斯纪生态系统
背景情况:
- 斑马是三叠纪的海洋爬行动物,以强壮的下巴和专门的粉碎牙而闻名.
- 在整个虫进化过程中发生了牙变化,这表明了饮食和养策略的适应.
- 了解 placodont 饮食是重建三叠纪海洋食物网和环境条件的关键.
研究的目的:
- 为了研究9个欧洲中期到三叠纪晚期的 placodont 物种的牙磨损模式.
- 为了确定是否存在饮食转变或分组在 placodont 物种.
- 为了将牙磨损与特里亚斯纪时期的环境变化和息地条件相关联.
主要方法:
- 使用2D和3D微磨损技术分析牙磨损模式.
- 检查 placodont 牙上的磨损特征,孔大小和划痕数.
- 将磨损模式与现代海洋哺乳动物进行比较,以推断饮食偏好.
主要成果:
- 3D微型磨损分析显示,物种之间没有明显的分离.
- 2D分析确定了两个组:一个具有低磨损特征和大坑,另一个具有高特征数量和小坑.
- 牙磨损与牙大小相关:较大的牙具有较少,较大的特征,表明食用较大的食物.
结论:
- 普拉科登的饮食有所变化,像Placochelys,Psephoderma和Paraplacodus这样的一些物种很可能有混合饮食,而不仅仅是硬食物.
- placodont Henodus 可能将植物物质纳入其饮食中,类似于现代草食海洋动物.
- 牙科微型磨损分析提供了关于已灭绝的海洋爬行动物的养生态和饮食适应性的见解.
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