张氏西峡爪龙(兽脚类：阿尔瓦雷斯龙类)第二跖骨的骨组织学及其对“窄足型”足部结构发育的启示

秦子川, 赵祺, 徐星

Metatarsal II osteohistology of Xixianykus zhangi (Theropoda: Alvarezsauria) and its implications for the development of the arctometatarsalian pes

QIN Zi-Chuan, ZHAO Qi, XU Xing

Fig. 1 The holotype of Xixianykus zhangi (XMDFEC V 0011)and the sketch diagram for where the ground sections sliced A. in ventral view (a dotted line indicates the sampled position); B. the dorsal (B1), ventral (B2) and medial (B3) views of its distal portion of right tarsometatarsus; C. the sketch diagram showing the spatial relation between the metatarsals II and III on the thin section (the metatarsal II colored in white is where we histologically sectioned). C is not scaled Abbreviations: FE. femur; FI. flange; IL. ilium; IS. ischium; MT II. metatarsal II; MT III. metatarsal III;MT IV. metatarsal IV; PU. pubic; SV. sacral vertebrae; TM. tarsometatarsus; TT. tibiotarsus