Abstract:  A new sauropod dinosaur, Huangshanlong anhuiensis gen. et sp. nov. is described based on specimens including right humerus, radius, and ulna from the Middle Jurassic Hongqin Formation of Shexian, Huangshan, Anhui Province. Comparative studies show thatHuangshanlong can be assigned to Mamenchisauridae. Members of Mamenchisauridae, including Huangshanlong, have 25° outward torsion of the distal end of the humerus, well-developed two accessory processes on the cranial edge of the distal end of the humerus, and well-developed two cranial processes on the proximal end of the ulna which forms an angle of 90° or slightly less. Compared to other members of Mamenchisauridae, Huangshanlong possesses a unique combination of features, such as transverse length of the proximal end of the humerus is 36% of the total length of the humerus, accessory processes are located near the middle of the cranial edge of the distal end of the humerus, length of the radius is 58% of that of the humerus, length of the ulna is two thirds of that of the humerus, craniomedial process on the proximal end of the ulna is longer than the craniolateral one, and ridges develop on the cranial, caudomedial, and caudolateral faces of the distal portion of the ulna. Huangshanlong represents the first Jurassic as well as the second dinosaur species in Anhui Province.

摘要： 记述了发现于安徽省黄山市歙县中侏罗统洪琴组的蜥脚类恐龙一新属种：安徽黄山龙Huangshanlong anhuiensis gen. et sp. nov.。黄山龙保存了右侧肱骨和桡尺骨，对比研究发现可以将其归入马门溪龙科。黄山龙和马门溪龙科其他成员一样肱骨远端向外侧扭转25°并在其上有发育的附突，尺骨两前臂突发育并形成90°或略小的夹角。与马门溪龙科其他属种相比，黄山龙又具有独特的特征组合：肱骨近端长为肱骨长的36%, 远端附突位于中部；桡骨为肱骨长的58%; 尺骨为肱骨长的2/3, 尺骨两臂突中的内前突更长，尺骨远端前面、外后面和内后面上都有棱嵴发育。黄山龙是安徽境内发现的第一个侏罗纪也是第2个恐龙化石种。