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1 January 2011 The First Cranial Remains of the Pleistocene Proterotheriid Neolicaphrium Frenguelli, 1921 (Mammalia, Litopterna): A ComparativeApproach
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Abstract
The first cranial and upper dental remains of a proterotheriid referred to Neolicaphrium cf. N. recens Frenguelli, 1921, are described from the late Pleistocene of northern Uruguay (Sopas Formation). An isolated molariform from the Pleistocene of northeastern Pampean Argentina is considered as Neolicaphrium sp. It is the last surviving Pleistocene Proterotheriidae. An expanded diagnosis of this genus-based until now only on mandibular characters-is provided. The following combination of characters distinguish it from other genera of proterotheriids for which characters of the skull have been described: dorsal surface of skull almost parallel to the occlusal surface of the cheek teeth series; relatively large orbits and diastema; very large caniniform upper incisors; upper premolars and molars relatively low crowned; P2 nearly quadrangular; molariforms (at least P4 and M1–3) with anterolingual cingulae; anteroposteriorly short upper molar series; M1–3 with metaconule reduced to a small transverse crest connecting the hypocone to the metacone; hypocone reduced (or nearly absent), particularly in M3; M3 located below the orbit. A principal component analysis places it near the smallest species of proterotheriids, which were separated very well along the second component, usually related to shape.
© 2011 by the Society of Vertebrate Paleontology
Martín Ubilla, Daniel Perea, Mariano Bond and Andrés Rinderknecht "The First Cranial Remains of the Pleistocene Proterotheriid Neolicaphrium Frenguelli, 1921 (Mammalia, Litopterna): A ComparativeApproach," Journal of Vertebrate Paleontology 31(1), (1 January 2011). https://doi.org/10.1080/02724634.2011.539647
Received: 19 February 2010; Accepted: 1 August 2010; Published: 1 January 2011
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