Electronic supporting information for: Evolution of posture in amniotes–diving into the trabecular architecture of the femoral head

Extant amniotes show remarkable postural diversity. Broadly speaking, limbs with erect (strongly adducted, more vertically oriented) posture are found in mammals that are particularly heavy (graviportal) or show good running skills (cursorial), while crouched (highly flexed) limbs are found in taxa with more generalized locomotion. In Reptilia, crocodylians have a “semi-erect” (somewhat adducted) posture, birds have more crouched limbs and lepidosaurs have sprawling (well-abducted) limbs. Both synapsids and reptiles underwent a postural transition from sprawling to more erect limbs during the Mesozoic Era. In Reptilia, this postural change is prominent among archosauriforms in the Triassic Period. However, limb posture in many key Triassic taxa remains poorly known. In Synapsida, the chronology of this transition is less clear, and competing hypotheses exist. On land, the limb bones are subject to various stresses related to body support that partly shape their external and internal mor..., , , # Gônet et al. Evolution of posture in amniotes–Diving into the trabecular architecture of the femoral head. Electronic supporting information.

[Access this dataset on Dryad](10.5061/dryad.83bk3j9x2)

This dataset contains the information files that support the results presented in the study by Gônet, J., Laurin, M., & Hutchinson, J. R.

## Description of the data and file structure

The file entitled Phylogenetic\_Trees.tre contains the 100 phylogenetic trees used in the study. The trees are in Newick (parenthetic) format. The file can be opened and modified as a .txt file, but is intended for use in R as part of the analyses presented in the study.

The file entitled Supporting\_Information.pdf contains the supplementary figures and tables mentioned in the main text of the study.

The file entitled Bone\_Cubes.rar contains the new microanatomical data obtained to complement the original data from Doube et al. (2011). The archive contains 25 folders corresponding to the 25 amniote...

现存羊膜动物（amniotes）展现出显著的姿势多样性。总体而言，四肢呈现直立（强内收、更接近垂直取向）姿势的类群，多为体型沉重的重型负重（graviportal）哺乳动物，或是具备优秀奔跑能力的适跑（cursorial）类群；而四肢呈现蜷缩（高度屈曲）姿势的类群，则多采用更泛化的运动模式。在爬行纲（Reptilia）中，鳄目类群拥有“半直立”（轻度内收）的姿势，鸟类的四肢更偏向蜷缩状态，鳞龙类则为充分外展的匍匐姿势。合弓类（Synapsida）和爬行类均在中生代（Mesozoic Era）经历了从匍匐姿势向更直立姿势的演化转变。在爬行类中，这一姿势转变在三叠纪（Triassic Period）的主龙形类（archosauriforms）中尤为显著，但许多关键三叠纪类群的四肢姿势仍鲜为人知。而在合弓类中，该转变的时间序列尚不明晰，目前存在多种相互竞争的假说。在陆地环境中，四肢骨骼会承受与躯体支撑相关的多种应力，这些应力在一定程度上塑造了其外部与内部形态……# Gônet等人《羊膜动物的姿势演化——深入探究股骨头（femoral head）骨小梁结构（trabecular architecture）》，电子补充材料。

可在Dryad数据库访问本数据集：10.5061/dryad.83bk3j9x2

本数据集包含支撑Gônet J、Laurin M与Hutchinson JR此项研究结果的相关资料文件。

## 数据与文件结构说明
命名为Phylogenetic_Trees.tre的文件包含本研究使用的100棵系统发育树，这些树采用Newick（括号式）格式。该文件可作为.txt文件打开并编辑，专为配合R软件用于本研究的分析流程而设计。
命名为Supporting_Information.pdf的文件包含研究正文中提及的补充图表与表格。
命名为Bone_Cubes.rar的归档文件包含为补充Doube等人（2011）原始数据而获取的全新显微解剖学数据，该归档包含对应25种羊膜动物的25个文件夹……