All four species are from the Bullock Creek in the Northern Territory and Riversleigh of Australia.

[2] A revision of Neohelos found a set of features in all the species that are absent in all other diprotodontoids.

N. davidridei shows many features that are also found in Kolopsis, and is thought to be the ancestor of it and its species.

[2] Neohelos lived in the early to Middle Miocene of Queensland, Australia.

It is one of a few diprotodont genera that existed in all three of Bullock Creek in the Northern Territory, Riversleigh in Queensland, and the Wipajiri Formation of South Australia.