Abstract
Abstract. Fossil sirenians are well known from the Western Atlantic and Caribbean (WAC) region. Neogene records from the Atlantic coast of South America, although scarce, seem to reflect a similar taxonomic composition to its northern contemporaries. Fossil sirenians from Argentina are known from the late Miocene Parana and Ituzaingo formations in Entre Rios Province. An upper third molar housed in the Museo de Paleontologia de la Universidad Nacional de Cordoba (CORD-PZ 4301), from the Parana Formation, was originally described and assigned to the dugongid genus Metaxytherium Christol. Subsequent workers suggested it could instead belong to the dugongid genus Dioplotherium Cope, a designation that we confirm upon examination of the material. Additionally, we describe new sirenian remains from the Parana Formation, consisting of two incomplete maxillae with teeth, belonging to one individual, deposited at the Museo de Ciencias Naturales de Parana (MASP 373). This specimen shows similarities with species o...
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