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December 2018
Vol 41-2
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Print ISSN: 0031-0247
Online ISSN: 2274-0333
Frequency: biannual

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On the genus Dikkomys (Geomyoidea, Mammalia)
Morton Green and Philip R. Bjork
Keywords: Dikkomys; Geomyoidae; North America
 
  Abstract

    The geomyoid genus Dikkomys is well represented in a sample from the Black Bear Quarry Il local fauna of Early Hemingfordian age in Bennett County, South Dakota. Isolated unworn P/4's of Dikkomys matthewi WOOD have a prominent median cristid (sagicristid) with a connection to the metaconid and the hypolophid. With wear, P/4 does not become as molariform as P/4 because of this cristid.
    A large sample of the Whitneyan beteromyid Proheteromys nebraskensis WOOD contains variants of the P/4 with on incipient sagicristid in approximately 18 percent of the population. The upper dentition and lower molars of Proheteromys nebraskensis are sufficiently generalized to indicate probable ancestry to Dikkomys


  Article infos

Published in Vol. 9, Ext (1980)

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