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A New Species of Purgatorius (Mammalia; Primatomorpha) from the Lower Paleocene Bear Formation, Crazy Mountains Basin, South-Central Montana

Gregory A. Buckley
Journal of Paleontology
Vol. 71, No. 1 (Jan., 1997), pp. 149-155
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/1306549
Page Count: 7
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A New Species of Purgatorius (Mammalia; Primatomorpha) from the Lower Paleocene Bear Formation, Crazy Mountains Basin, South-Central Montana
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Abstract

Purgatorius titusi, represented by 51 teeth and jaw fragments, is described from the lower Paleocene Bear Formation of the Crazy Mountains Basin in south-central Montana. Several synapomorphies, including a weak postprotocingulum and mesial inflection of molar trigonids, are indicative of the taxon's "plesiadapiform" affinities. Other features, such as wider stylar shelf and a less squared lingual outline on upper molars, are more primitive than those of Purgatorius unio, heretofore the earliest occurring species of well-represented primatomorphs.

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