What is "neohelos"

Neohelos is an extinct diprotodontid marsupial, that lived from the early to middle- Miocene. There are four species assigned to this genus, N. tirarensis, the type species, N. stirtoni, N. solus and N. davidridei. N. davidridei is the most derived species of the genus, and its premolar morphology shows that it is structurally and ancestor of the genus Kolopsis. All four species are from the Bullock Creek in the Northern Territory and Riversleigh of Australia.