Wyonycteris

Wyonycteris is a genus of small mammals that existed in the late Paleocene and early Eocene epochs. The type species is Wyonycteris chalix, which lived in Wyoming during the Clarkforkian North American Land Mammal Age of the Paleocene and was originally proposed to be an early form of insectivorous bat. Later re-examination of the material has put this alliance in doubt, and the genus has instead been proposed as belonging to the subfamily Placentidentinae, within the family Nyctitheriidae. Similar fossil material of the same time period found in Europe was later discovered and described as new species, Wyonycteris richardi.

Secord (2008) described the first known species of Wyonycteris from the Tiffanian NALMA, Wyonycteris galensis and W. microtis, although the status of both species as members of Wyonycteris has been questioned. The two largest species, W. primitivus and W. kingi, are known from the early Eocene of Mississippi and England, respectively.