What is "witwatia"

Witwatia (from the Egyptian Arabic Wit Wat meaning "large, flapping wings") is an extinct genus of giant bat that contained two species which lived in the Al Fayyum in Egypt during the late Eocene ( Priabonian epoch) and one species which lived in Tunisia during the early Eocene. It is known from a lower jaw and teeth. Three species have been named: the type species W. schlosseri, W. eremicus and W. sigei.