 "T. oceanicus" was originally regarded taxonomically as a geographic race of "T. commodus", but was later recognized as a distinct species as growing evidence of reproductive isolation and differences in calling sound were reported.The two species' geographic ranges remain mostly separate with the exception of small overlap zones in Eastern Australia.There have been no reports of hybridization between the species in this overlap zone, thought to be due to differences in calling song acting as a pre-zygotic barrier.