Abstract

Koniaryctes paulus is a very small apternodontid insectivore. It differs from Parapternodus in having: (1) lower molars with more rounded buccal sides of the protoconids; and (2) by having a wider talonid, with no heel cusp. Molar paraconids project forward, rather than upward as in Oligoryctes. The presence of two genera of apternodontids in the early Wasatchian indicates that significant evolution took place within that family prior to the Eocene. It is improbable that Koniaryctes was ancestral to the Chadronian genera Apternodus or Oligoryctes.

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