A partial tyrannosauroid femur from the mid-Cretaceous Wayan Formation of eastern Idaho, USA
A partial tyrannosauroid femur from the mid-Cretaceous Wayan Formation of eastern Idaho, USA
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DOI：
10.1017/jpa.2022.42
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发表时间：
2022-06
影响因子：
1.4
通讯作者：
L. Krumenacker;Lindsay E. Zanno;H. Sues
中科院分区：
文献类型：
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作者：
L. Krumenacker;Lindsay E. Zanno;H. Sues
抽象的。人们对白垩纪中期霸王龙的多样性知之甚少。我们描述了爱达荷州东部阿尔比亚-塞诺马尼亚瓦延组的部分霸王龙股骨，这有助于填补北美霸王龙记录中的一个重要的时空空白。这具标本由骨骼的近半部分组成，在形态上类似于Moros Intrepidus的股骨，Moros Intrepidus是犹他州雪松山组Cenomania Mussenuchit成员的一种小型霸王龙，但与该分类单元无关。大雁的股骨缺乏Moros Intrepidus的自动形态诊断，这表明在拉米迪亚早期晚白垩世早期存在一个以前未被识别的霸王龙类群。组织学结果表明，在死亡时，这个人至少五岁，骨骼不成熟，正在以中等速度生长。这种霸王龙的加入为晚白垩世早期拉米迪亚广泛分布各种霸王龙类群提供了额外的证据。
Abstract. The diversity of mid-Cretaceous tyrannosauroids is poorly understood. We describe a partial tyrannosauroid femur from the Albian–Cenomanian Wayan Formation of eastern Idaho that helps to fill in an important spatiotemporal gap in the North American record of tyrannosaurs. This specimen, consisting of the proximal half of the bone, is morphologically similar to the femur of Moros intrepidus, a small-bodied tyrannosauroid from the Cenomanian Mussentuchit Member of the Cedar Mountain Formation of Utah, but not referable to this taxon. The Wayan femur lacks an autapomorphy diagnostic for Moros intrepidus, indicating the presence of a previously unrecognized tyrannosauroid taxon in the early Late Cretaceous of Laramidia. Histological results indicate that, at the time of death, this individual was at least five years old, skeletally immature, and undergoing growth at a moderate rate. The addition of this tyrannosauroid to the Wayan-Vaughn Assemblage provides additional evidence for the widespread distribution of various tyrannosauroid taxa in Laramidia during the early Late Cretaceous.