AN lang=EN-US style="FONT-SIZE: 14pt; FONT-FAMILY: ’Times New Roman’; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">The Middle Pleistocene Caryomys from Zhangping caves, Luonan County, Shaanxi Province is described into two extant species, C.eva and C.inez, that only live in North China. C.eva is characterized by 5 lingual and 4 buccal salient angles on m1 and by 3 lingual and 3 buccal salient angles on M3. C.inez is slightly more complicated than C.eva because its m1 has 6 lingual salient angles and its M3 has an elongated posterior loop with the fourth lingual salient angle sometimes. It is different from C.regulus living in Korea which has only 5 lingual salient angles on m1 and has the fourth lingual and buccal salient angles on M3. The average values of teeth are distinctly larger in C.inez than in C.eva. The fact that the teeth have not evolved since middle Middle Pleistocene (493an’; mso-hansi-font-family: ’Times New Roman’; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">±ang=EN-US style="FONT-SIZE: 14pt; FONT-FAMILY: ’Times New Roman’; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">55 ka BP) indicates that the genus Caryomys is a relatively conservative member of the subfamily Arvicolinae.
