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Megantereon hesperus from the Late Hemphillian of Florida with Remarks on the Phylogenetic Relationships of Machairodonts (Mammalia, Felidae, Machairodontinae)
Annalisa Berta and Henry Galiano
Journal of Paleontology
Vol. 57, No. 5 (Sep., 1983), pp. 892-899
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1304759
Page Count: 8
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The smilodontine felid Megantereon hesperus is described from the latest Hemphillian (early Pliocene) Upper Bone Valley Formation of central Florida. The Florida record marks the earliest known occurrence of Megantereon and adds to our poorly known record of this genus in North America. Old World records suggest immigration of Megantereon to Eurasia and Africa in the early Villafranchian (middle Pliocene). The genus is not known in North America after the middle Blancan (middle Pliocene). Within a cladistic framework, Megantereon hesperus is more primitive than the Old World species as judged by its larger lower canine and P3. Diagnostic characters of M. hesperus include: development of a prominent groove on the medial surface of the mandible and a stronger dorsoventral ridge marking the anterolateral rim of the mandibular flange. Megantereon and Smilodon are sister taxa and form the tribe Smilodontini Kurtén, 1963.
Journal of Paleontology © 1983 SEPM Society for Sedimentary Geology