Angles and indices of non-mammaliaform cynodonts.

TH, torsion of humeral shaft; ADC, angle of deltopectoral crest; LDC, length ratio of deltopectoral crest (Length of deltopectoral crest / Humeral length * 100); DW, width ratio of distal end (Distal end width / Humeral length). The angle TH was measured between the transversal axes of the proximal end (the axis “Lesser Tuberosity—Medial margin of the humeral head”) and the distal end (the axis “Ectepicondyle-Entepicondyle”), based on the photography of the humerus in proximal view. The angle ADC was measured between the deltopectoral crest and the transversal axis of the proximal end, based on the photography of the humerus in proximal view. The distal end width was measured between the two epicondyles, based on the photography of the humerus in anterior view.

本数据集涉及的参数定义如下：TH即肱骨干扭转角（torsion of humeral shaft）；ADC即三角肌胸肌嵴夹角（angle of deltopectoral crest）；LDC即三角肌胸肌嵴长度占比（length ratio of deltopectoral crest，计算公式为：三角肌胸肌嵴长度/肱骨干长度×100）；DW即肱骨远端宽度占比（width ratio of distal end，计算公式为：远端宽度/肱骨干长度）。
TH的测量基于肱骨近端观摄影图像，在近端横轴（轴定义为“小结节——肱骨头内侧缘”）与远端横轴（轴定义为“外上髁-内上髁”）之间测得夹角。
ADC的测量基于肱骨近端观摄影图像，在三角肌胸肌嵴与近端横轴之间测得夹角。
肱骨远端宽度的测量基于肱骨前视图摄影图像，在两侧上髁之间测得距离。