sentences:  This rail is related to the New Guinea flightless rail, "Megacrex inepta", and the chestnut rail, "Eulabeornis castaneoventris", all three Australasian genera probably being derived from "Amaurornis" ancestors.Storrs Olson argued that the genus "Megacrex" was so similar to "Habroptila" that "Megacrex" should be considered a junior synonym of "Habroptila", resulting in two species in the genus.This was further lumped in Sidney Dillon Ripley's 1977 monograph of the Rallidae; he included "Habroptila" within the large genus "Rallus".