Specimens sampled for histological analysis in this study.

All samples were derived from femoral mid-shafts in areas devoid of bone scars indicative of muscle attachments, including for those samples indicated with an * in which the element was partially preserved. Samples extracted from holotypes that consist of a single individual are indicated by a superscript H. Except for these singleton holotypes, most samples were drawn from larger specimens than those previously studied. Samples for Hyperodapedon and Herrerasaurus were extracted from the largest available specimens, which are equivalent in size to previously studied elements [15–19]. Data on habitat, diet, and estimated body mass are derived from Martínez and colleagues [67]. Institutional Abbreviations: PVSJ (División de Paleontología de Vertebrados del Museo de Ciencias Naturales y Universidad Nacional de San Juan, San Juan, Argentina).所有样本均取自股骨骨干中段，且避开存在肌肉附着相关骨痕的区域；其中标注星号（*）的样本，其骨骼元素仅部分保存。由单一个体正模标本（holotype）提取的样本，均标注有上角标H。除上述单一个体正模标本外，多数样本取自大于此前研究所用标本的个体。喙头龙属（Hyperodapedon）与埃雷拉龙属（Herrerasaurus）的样本均取自当前可获得的最大个体，其骨骼尺寸与此前研究中所用标本相当[15–19]。有关生境、食性及估算体重的数据源自Martínez及其合作者的研究[67]。机构缩写说明：PVSJ（阿根廷圣胡安国立大学自然科学博物馆脊椎古生物学部，圣胡安，阿根廷）。