In the continental deposits of the area of Tollo de Chiclana (Guadix Basin, south-eastern Spain), several new fossiliferous Pliocene localities yield a rich rodent and insectivore fauna. Of the various rodent families that occur in these sites, Muridae are the most abundant and diversified. Eleven species belonging to seven different genera (Occitanomys, Stephanomys, Castillomys, Paraethomys, Apodemus, Rhagapodemus, and Micromys) have been recognized. In this paper we describe the Muridae from these localities, which have great biostratigraphical and paleoecological interest. The presence of certain taxa and the changes in the abundance of the various taxonomic groups indicate a decrease in temperature and a change in the biotopes from Late Ruscinian through Middle Villafranchian in the area of Tollo de Chiclana.
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