songae Meng, et al., 2014 Xianshou is a genus of gliding[1] haramiyidan synapsid known from the Oxfordian stage of the Jurassic period, approximately 160 million years ago.

Two species, X. linglong and X. songae, are known from fossils of the Tiaojishan Formation in the Liaoning province of China.

It can be distinguished from X. songae and Shenshou by the sharper cusps and ridges of its upper molars, and by larger size.

[2] More recent study of Xianshou suggests that, like the closely related Maiopatagium and Vilevolodon, it may have had a patagia and the ability to glide.

No patagium is preserved in Xianshou fossils, but the morphology of the limbs and pes is most similar to those of extant gliding mammals.