Abstract
The Calatayud-Teruel Basin is one of the richest areas of Spain, when fossil mammals are concerned. Around the village of Montalban many lower Oligocene fossil mammal localities are known and several upper Oligocene localities with rich micromammal faunas are present between the villages of Vivel del Rio Martin and Martin del Rio. Previous papers on these upper Oligocene localities were dedicated to the Cricetidae and to the zapodid Plesiosminthus , in this work we describe the fauna of Gliridae, composed of the genera Gliravus , Butseloglis , Peridyromys , Microdyromys and Paraglis . Among these the latter genus is very poorly represented. Microdyromys is of special importance because its presence in our material permits a new concept of the phylogeny of the genus.
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