What is "prohepialus"

Prohepialus is an extinct genus of moth in the Hepialidae family. It contains only one species, Prohepialus incertus, which was described from a Thanetian crater lake diatomite ( Paleocene) in Menat (Puy-de-Dôme), France. A second specimen is known from the Bembridge Marls ( Eocene) in the United Kingdom.