A New Species of Flightless Auk from the Miocene of California (Alcidae: Mancallinae)

Abstract

<i>Praemancalla wetmorei </i>is described from the late Miocene of Orange County, California, with humerus and ulna as holotype and paratype, and radius, carpometacarpus, and coracoid referred. The species, although less specialized as a flightless diver than the geologically younger genus <i>Mancalla,</i> appears to be more advanced then <i>Praemancalla lagunensis</i>, which is believed to be derived from slightly older deposits.