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1 January 2017 Evidence for Two sympatric sirenian species (Mammalia, Tethytheria) in the early Oligocene of Central Europe
Manja Voss, Oliver Hampe
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Abstract

The early Oligocene (Rupelian) sirenian Halitherium schinzii Kaup, 1838, which represents the type species of the genus Halitherium Kaup, 1838, is revised herein based on a morphological re-evaluation of skeletal material originally assigned to this taxon. This study provides new and comprehensive information on the cranial and postcranial anatomy and allows the distinction of two sympatric species. Following a recent approach on the invalidity and subsequent rejection of H. schinzii Kaup, 1838, Kaupitherium gruelli new genus new species is established on the basis of a nearly complete holotype. The second taxon resembles K. gruelli n. sp. in a number of skeletal features, such as reduced nasals and absence of the canines, but can be clearly distinguished mainly by the post-canine dental formula and the supraoccipital morphology. The diagnostic skullcap of a species formerly synonymized under “H. schinzii” is re-validated as the holotype of K. bronni (Krauss, 1858). On the basis of paleoecological implications, a hypothesis is established to explain the overlapping stratigraphic and biogeographic occurrences (i.e., sympatry of both taxa). A diagnosis and up-to-date synonymy complement the taxonomical information. The revision of “H. schinzii” provides new data on the past sirenian diversity and forms the basis for a taxonomic and systematic re-evaluation of species originally grouped in the genus “Halitherium.”

© 2017, The Paleontological Society
Manja Voss and Oliver Hampe "Evidence for Two sympatric sirenian species (Mammalia, Tethytheria) in the early Oligocene of Central Europe," Journal of Paleontology 91(2), 337-367, (1 January 2017). https://doi.org/10.1017/jpa.2016.147
Accepted: 1 September 2016; Published: 1 January 2017
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