This northern species has been reported from Ky. by Kellerman (1959) and others, but colls. have not been verified (FNA 22). Colls. that were initially labelled as spirillus from FULT (KY-Agr.), JEFF (DHL) and UNIO (GH, KY-Agr.) are probably diversifolius. The two species are close and can easily be confused.