A Fossil Gymnopternus Loew (Diptera: Dolichopodidae) from the Florissant Beds, Colorado

Abstract

Gymnopternus lacustris n. sp. (Diptera: Dolichopodidae) is described from a compression fossil from the Eocene/Oligocene Florissant beds of Colorado, U.S.A. Gymnopternus has a rich recent fauna in North Americm and its fossil presence in these deposits is evidence of the essentially “modern” generic composition of the Tertiary dolichopodid fauna.