Wikipedia
Seorsumuscardinus is a genus of fossil dormice from the early Miocene of Europe. It is known from zone MN 4 (see MN zonation) in Oberdorf, Austria; Karydia, Greece; and Tägernaustrasse-Jona, Switzerland, and from zone MN 5 in a single site at Affalterbach, Germany. The MN 4 records are placed in the species S. alpinus and the sole MN 5 record is classified as the species S. bolligeri. The latter was placed in a separate genus, Heissigia, when it was first described in 2007, but it was reclassified as a second species of Seorsumuscardinus in 2009.
The two species of Seorsumuscardinus are known from isolated teeth, which show that they were medium-sized dormice with flat teeth. The teeth are all characterized by long transverse crests coupled with shorter ones. One of these crests, the anterotropid, distinguishes the two species, as it is present in the lower molars of S. alpinus, but not in those of S. bolligeri. Another crest, the centroloph, reaches the outer margin of the first upper molar in S. bolligeri, but not in S. alpinus. Seorsumuscardinus may be related to Muscardinus, the genus of the living hazel dormouse, which appears at about the same time, and the older Glirudinus.