Abstract
Tynskya eocaena n. gen. n. sp. is described from Lower Eocene deposits of the Green River Formation (Wyoming, USA). The species is characterized by a distinctive morphology of the tarsometatarsus. AlthoughTynskya eocaena resembles the Lower and Middle Eocene PseudasturidaeMayr 1998 and some recent strigiform and falconiform birds in several aspects, it has not been possible to find derived characters which convincingly support a classification of this species into one of the known higher avian taxa. Birds closely related toTynskya eocaena have also been found in the Lower Eocene London Clay of Walton-on-the-Naze (Essex, England) and give a further example of the great similarity between the early Eocene avifauna of North America and Europe.
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