Abstract
A new diatomyid genus and species, Inopinatia balkanica, from the early Oligocene of south-east Serbia is described, and the affinities between the Diatomyidae and Ctenodactylidae are discussed. Inopinatia balkanica nov. gen. nov. sp. seems to have retained its deciduous teeth throughout life just as all other species of the family. The only other diatomyid described from outside south-east Asia which is Pierremus explorator López-Antoñanzas, 2010 is transferred to the thryonomyid species Paraphiomys knolli López-Antoñanzas and Sen, 2005.
Highlights
During the ongoing research of the Natural History Museum of Belgrade, upper Eocene and lower Oligocene non-marine deposits in basins of southern Serbia were investigated for the presence of fossil mammals
The two morphs distinguished by Flynn et al (1986) and by Marivaux and Welcomme (2003) among the premolars of Fallomus that were thought to mark deciduous from permanent teeth, seem to be within the range of the individual variation of the milk teeth
All known species of the Diatomyidae seem to have retained the deciduous teeth throughout life
Summary
During the ongoing research of the Natural History Museum of Belgrade, upper Eocene and lower Oligocene non-marine deposits in basins of southern Serbia were investigated for the presence of fossil mammals. Oligocene rodent faunas were discovered in 2010 by Zoran Marković and Miloš Milivojević (Natural History Museum) in the BabušnicaKoritnica basin. The discovery was soon followed by collecting campaigns in close cooperation with Hans de Bruijn and Wilma Wessels of the University of Utrecht. Two rodent faunas of late Eocene age and five of early Oligocene age have been found. The geographical position and an overview of fossil content of these sites we refer to Bruijn et al (in press).
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