The Interatheriinae (Mammalia, Notoungulata) of the Friasian <i>sensu stricto</i> and Mayoan (middle to late Miocene), and the fossils from Cerro Zeballos, Patagonia, Argentina
收藏资源简介：
The middle to late Miocene Friasian <i>sensu stricto</i>, Colloncuran and Mayoan South American Land Mammal Ages (SALMAs) were established based on the mammals recovered from the Río Frías, Collón Curá and Río Mayo formations, respectively (southern Argentina and Chile). Records of Interatheriinae (Notoungulata) from these sediments have been known since the first contributions of Ameghino and Roth, but most of this material has only been superficially revised or is almost unstudied. Based on these old collections and new interatheriine records from Cerro Zeballos (Chubut Province), we improve the diagnosis of <i>Caenophilus tripartitus</i>, describe new and peculiar characters for this taxon, consider <i>Epipatriarchus bifidens</i> as <i>Protypotherium</i> cf. <i>colloncurensis</i>, and propose <i>Epipatriarchus</i> as a junior synonym of <i>Protypotherium</i>. In turn, the holotype of <i>Epipatriarchus innexus</i> is here identified as the mesotheriid <i>Trachytypotherium</i> sp. Therefore, only two genera of Interatheriinae, <i>Protypotherium</i> and <i>Caenophilus</i>, are recognized in the Friasian <i>sensu stricto</i> and Mayoan. We identify <i>Protypotherium</i> cf. <i>endiadys</i> and a probable new species of <i>Protypotherium</i> for the Friasian <i>sensu stricto</i>, <i>P</i>. cf. <i>colloncurensis</i> and <i>Caenophilus tripartitus</i> for the Mayoan, and <i>C. tripartitus</i>, <i>P. colloncurensis</i> and <i>P</i>. cf. <i>endiadys</i> for Cerro Zeballos. An extended phylogenetic analysis is performed, including species from low latitudes and new data for <i>P</i>. <i>colloncurensis</i> and <i>Caenophilus tripartitus</i>, with the latter recovered as a sister taxon to <i>Miocochilius federicoi</i>. Both <i>Protypotherium</i> and <i>Miocochilius</i> are recovered as paraphyletic. The updated information we present provides a better knowledge of Interatheriinae for the middle to late Miocene of southern South America.
