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A New Species of Pediomeryx from the Late Miocene of Florida, and Its Relationships within the Subfamily Cranioceratinae (Ruminantia: Dromomerycidae)

S. David Webb
Journal of Mammalogy
Vol. 64, No. 2 (May, 1983), pp. 261-276
DOI: 10.2307/1380556
Stable URL: http://www.jstor.org/stable/1380556
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A New Species of Pediomeryx from the Late Miocene of Florida, and Its Relationships within the Subfamily Cranioceratinae (Ruminantia: Dromomerycidae)
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Abstract

A new species of Pediomeryx, represented by a large sample from the late Miocene (late Clarendonian) Love Bone Bed in Florida, establishes an association between Yumaceras-like ossicones and Pediomeryx-like dentitions, thus indicating subjective synonymy between these genera. The sample also provides the basis for recognizing the subfamily Cranioceratinae within the Dromomerycidae. The included genera, Barbouromeryx, Bouromeryx, Cranioceras (including subgenus C. [Procranioceras]), and Pediomeryx (including subgenus P. [Yumaceras]) form a simple stratigraphic succession through the medial and late Miocene. This subfamily is most readily characterized by the presence of a median occipital ossicone in presumed male skulls. Pediomeryx is distinguished from Cranioceras by its longer paired frontal and median occipital ossicones, each about 250 mm long, shorter premolar row, "closed" P4, absence of Palaeomeryx-fold from the lower molars, mesodont (not brachydont) molars, and mandible with nearly straight ventral border. The subgenus P. (Yumaceras) ranged from late Clarendonian through early Hemphillian. In late Hemphillian time it was succeeded by P. (Pediomeryx) characterized by smaller size, nearly hypsodont molars, and more abbreviated premolars. Procoileus is a synonym of P. (Pediomeryx). Pediomeryx, the last of the Dromomerycidae, disappeared during the late Hemphillian, shortly before the first appearance of the true Cervidae in North America.

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