ANTERIOR DENTITION AND RELATIONSHIPS OF THE EARLY EOCENE OMOMYIDS ARAPAHOVIUS-ADVENA AND TEILHARDINA-DEMISSA, SP-NOV

Two dentaries from the Wasatchian Willwood Formation of the Bighorn Ba sin, Wyoming, constitute the first evidence of the anterior teeth of t he omomyid Arapahovius advena. Another specimen, preserving intact cro wns of nearly all the lower teeth, represents a derived new species of Teilhardina. The two species appear to be closely related and provide evidence on the interrelationships of diminutive omomyids. Arapahoviu s and Anemorhysis are sister taxa that probably evolved from a derived species of Teilhardina.