Abstract
ABSTRACT In this work seventeen new maxillary and mandibular dental pieces of the endemic palaeotheriids Leptolophus sp., Iberolophus jimenezi, Plagiolophus mazateronensis, Palaeotherium giganteum, Franzenium durense and Cantabrotherium casanovasae from the late middle Eocene (Bartonian, MP 16) of Mazaterón (Soria, Almazán Basin) are described. The palaeotheriid fauna from Mazaterón is diverse but each species is known by few specimens, and some of them by only upper or lower dentition. Here the first upper dentition of Franzenium durense and the first mandible and lower dentition of the genus Cantabrotherium are described. The new material here reported allows to a better knowledge of the endemic fauna of the western Iberian region, mainly of the genera Franzenium and Cantabrotherium and of all the fossil assemblage of Mazaterón.
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