Abstractof the new subgenus include：yarlungensis sp. n. were identified in addition to the 3 assigned to Alienauroa. The identifying characteristics of O. huanglongnensis (collected at the Huanglong National Scenic Reserve; Sichuan) include: front part of incisive foramen parallel; skull flat, the height of skull (SH) only 33.5% of the greatest length of skull (GLS); ears large averaging over 20 mm; congenial tragus triangular and the distal part circular; back hairs coarse and long averaging over 20 mm; the ventral hairs gray white; the back of the palms gray white; the ventral palm gray black; finger and digital pads large and orange, exposed out of hairs, and claws translucent. The identifying characteristics of O. flatcalvariam (collected from the Longmen mountains, Sichuan province) include: skull very flat, average SH 11 mm, SH only 31% of GLS; eye sockets very small, only 6.7 mm in length and 5.6 mm in breadth; body length less than 140 mm; back hairs coarse and long averaging over 22 mm; ears small averaging over 17 mm, congenial tragus triangular and small, the distal part of congenial tragus broad-round; dorsal pelage sandy yellow, ventral pelage yellow white. The identifying characteristics of O. dabashanensis (collected from Dabashan Mountains, Sichuan province) include: congenial tragus sickle-liked; ear small, less than 17 mm on average, which is similar to O. sacraria and O. flatcalvariam, but less than O. huanglongensis and O. xunhuaensis; SH relatively large and bulged, posing the largest SH and eye sockets in Alienauroa, average SH 12.45 mm; eye sockets 8.52 mm×7.13 mm. O. yarlungensis (subgenus Ochotona; collected from the middle of the Yarlung Zangbo River; Xizang) has its closest relationship with O. curzoniae and O. nubrica lhasaensis. Its characteristics include: margin of lips lined with very narrow gray black hair, surrounding with gray white hair; soles and palms covered with dense black hairs, long hairs cover the claws, the digital pads and claws hidden in the hairs; head and body length average 150 mm, much less than that of O. curzoniae and O. nubrica lhasaensis; skull flatter than that of O. curzoniae; dorsal pelage gray brown. O. qionglaiensis (subgenus Ochotona; collected from the Qionglai Mountains; Sichuan) has its closest genetic relationship with O. curzoniae, although its measurements and appearance are close to that of O. thibetana. Compared with O. thibetana, O. qionglaiensis has a very narrow interorbital width (4.05 mm on average; range: 3.64 - 4.19 mm), while that of O. thibetana is >4.2mm (4.45 mm on average). O. qionglaiensis is covered with sandy yellow, coarse and long hairs, while O. thibetana is covered with black brown and relatively short hairs. The backs of the palms and feet of O. qionglaiensis are a withered grass yellow, while those of O. thibetana are yellow white.
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