For the first time in the south of the Russian Far East in the Late Pleistocene cave deposits, fragments of the giant flying squirrel of the genus Petaurista were discovered. Petaurista tetyukhensis n. sp. is described based on a fragment of the upper jaw with two teeth and five isolated teeth from two cave locations. The main differences between the new species and living forms as well as other fossil species of the genus Petaurista are the absence of vertical groove on the lingual wall between the protocone and hypocone on M2, the absence of the anterior cross loph on the upper P4-M3, and the absence of mesoconids on lower, as a result of which the hypoflexid is not w-shaped. It is suggested that the Sikhote-Alin refugium allowed individual species to survive there during long unfavourable period of time and was the centre of speciation.

在俄罗斯远东南部的晚更新世洞穴沉积物中，第一次发现了Petaurista属的巨型飞鼠的碎片。Petaurista tetyukhensis ñ。sp。根据上颌骨的片段描述，该片段具有两个牙齿和来自两个洞穴位置的五个孤立牙齿。Petaurista属的新物种和生物形式以及其他化石物种之间的主要区别是在M2的原锥和次圆锥的舌壁上没有垂直凹槽，在上部的P4-M3上没有前交叉口，在下部的中胚层没有，因此没有屈肌-成形。有人认为，锡克特-阿林避难所允许单个物种在很长的不利时间内在那里生存，并且是物种形成的中心。