This large and diverse genus of long-necked Chelid turtles has had a complicated nomenclatural history. Although in the past the following have been considered separate genera and prior to that all the same, they are now considered sub-genera of the one genus. Macrodiremys is a monotypic genus recently split off from the rest of the Chelodina. Its sole member is the enigmatic Chelodina Macrodiremys colliei from Western Australia.