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Abstract Two new small Eomys species of the Chattian Lower Freshwater Molasse of Central Switzerland are described. Eomys helveticus n. sp. and Eomys schluneggeri n. sp. from the localities Rigi 1 and Rigi 2 are characterized by their relatively small dimensions and the metalophid of the lower molars not being connected to the anterolophid. In addition, E. schluneggeri n. sp. shows some morphological similarity to the genus Eomyodon Engesser, 1987. The two new Eomys species have so far never been found in any of the numerous MP 25 and MP 26 localities in Central Europe. In both faunas Eomyidae and Gliridae were extremely frequent, whereas the Theridomyidae, usually the most frequent rodent family in the Late Oligocene, were very rare or absent. We interpret these peculiarities as being linked with the special ecological conditions, namely a relatively wet, forested environment.

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Eomys helveticus n. sp. and Eomys schluneggeri n. sp., two new small eomyids of the Chattian (MP 25/MP 26) subalpine Lower Freshwater Molasse of Switzerland