OMOMYID PRIMATES (TARSIIFORMES) FROM THE BRIDGER FORMATION, MIDDLE EOCENE, SOUTHERN GREEN RIVER BASIN, WYOMING

New specimens of omomyid primates from the Bridger Formation, middle E ocene, of southwestern Wyoming reveal the presence of one new genus an d two new species of anaptomorphines and two new genera and species of omomyines. The new genus and species of anaptomorphine, Sphacorhysis burntforkensis, has affinities with Trogolemur and suggests new relati onships within the tribe Trogolemurini. The new species of anaptomorph ine, Gazinius bowni, shows that this rare genus was not necessarily re stricted to basin margin faunas as previously thought. The new genera of omomyines, Wyomomys bridgeri and Ageitodendron matthewi, are both r elated to the late middle Eocene genus Ourayia, and help to clarify re lationships within the Ourayiini, new tribe. Further analysis of new s pecimens reveals that Hemiacodon and Macrotarsius are closely related and should be included in a tribe, Macrotarsiini, distinct from other omomyids. Omomyines dominate the omomyid primate radiation both in div ersity and total specimen number through most of the Bridgerian; anapt omorphines remain a rare, but persistent element of mammalian faunas t hrough the Bridgerian.