Coryphorus aquilus a new genus and species of Tricorythidae from the Amazon Basin (Ephemeroptera)

Abstract Coryphorus aquilus a new genus and species of the Tricorythidae, is described from nymphs collected in Brazil and Columbia and provisionally placed in the heretofore African subfamily Machadorythinae. The type locality is described. Relationships of Coryphorus to other genera of the Tricorythidae are discussed and illustrations of anatomical structures of Machadorythus are given for comparison.