Nexuotapirus
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''Nexuotapirus'' is an extinct genus of tapir from the
Late Oligocene The Chattian is, in the geologic timescale The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the pro ...
and
Early Miocene The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages: the Aquitanian age, Aquitanian and Burdigalian stages. The sub-epoch lasted from 23.03 ± 0.05 annum, Ma to ...
of
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
.


Taxonomy

''Nexuotapirus'' was erected in 1998. The type species, ''N. marslandensis'', was originally classified under '' Miotapirus''. The second species, ''N. robustus'', was originally placed in ''
Protapirus ''Protapirus'' (Latin: "before" (pro), + Brazilian Indian: "tapir" (tapira)) is an extinct genus of tapir known from the Oligocene and Miocene of North America and Eurasia. Taxonomy The type species is ''Protapirus priscus'' from the Late Oligoc ...
'' but was also moved to ''Nexuotapirus'' based on comparable lower dentition.


Description

''Nexuotapirus'' shows both
plesiomorphic In phylogenetics, a plesiomorphy ("near form") and symplesiomorphy are synonyms for an ancestral character shared by all members of a clade, which does not distinguish the clade from other clades. Plesiomorphy, symplesiomorphy, apomorphy, an ...
and derived features compared to other early tapirs, making its exact relationship with them difficult to place. Primitive traits of the genus include less molar-like premolars and incisive foramina that extend posteriorly through the postcanine diastema, as well as a braincase that tapers towards the back. More advanced features include deep retraction of the nasal incision, nasal shortening, frontal shortening, and reduction of the supraorbital process, features comparable to the modern ''
Tapirus ''Tapirus'' is a genus of tapir which contains the living tapir species. The Malayan tapir is usually included in ''Tapirus'' as well, although some authorities have moved it into its own genus, ''Acrocodia''. Extant species The Kabomani tapir ...
''.


References

{{Taxonbar, from=Q108336593 Prehistoric tapirs Oligocene Perissodactyla Oligocene mammals of North America Miocene Perissodactyla Miocene mammals of North America