Megadromus omaramae is probably the most restricted of all the species in its genus as it is common in a 5 ha patch of very dry mountain beech forest in the southern part of the Mackenzie Basin near Lake Ohau, and one specimen has been taken from a nearby larger, similar forest. Although common in that small patch of forest it does not occur even a few metres outside its very sharp borders (fire induced perhaps 50-100 years ago). The adjacent tussocky shrubland is occupied by Megadromus alternus.