Isalorhynchus genovefae was named by Buffetaut (1983). Its type specimen is MDE-R18, a maxilla (Almost complete maxilla), and it is a 3D body fossil. Its type locality is Malio River, Isalorhynchus holotype, which is in a Ladinian/Carnian terrestrial horizon in the Isalo II Formation of Madagascar. It is the type species of Isalorhynchus.

It was recombined as Hyperodapedon genovefae by Langer et al. (2000).