Abstract:
Recent discoveries of zygodactyl birds in the
Eocene of Wyoming, along with reinterpretation
of previously described taxa, show that these forms
belong to an extinct family, affiliated with the
Bucconidae, for which we here propose the name
Primobucconidae. The genera Primobucco, Neanis, Uintornis, Botauroides, and a new genus,
Eobucco, are assigned to this family, and three new
species, Primobucco olsoni, Uintornis marionae,
and Eobucco brodkorbi are described. Primobuc-
conids appear to have been the dominant small
perching birds of the Eocene of North America.
