Abstract:
Gobigeolabis verigranum gen. et sp. nov. is described based on jaw fragments from the Upper Paleocene Zhigden Member of the Naran Bulak Formation of the Tsagan-Khushu locality (Mongolia). This is the first Asian member of the Geolabididae, a soricomorph family that has previously been recorded from the Upper Cretaceous-Lower Miocene of North America. G. verigranum was an extremely small mammal; the dimensions of its m1 suggest this animal was approximately 2.25 g in body weight (i.e., similar in size to the smallest extant shrews).