 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 . This suggestion was , however , not accepted by Gerlof Fokko Mees , who pointed out distinct differences in the shape and structure of the bill . A molecular phylogenetic analysis based on mitochondrial DNA sequence similarity found that Habroptila is part of evolutionary radiation within the broad genus Gallirallus that took place around 400 @,@ 000 years ago in the region . 
 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 <a href='null_genetive' title='1'><mark>'s</mark></a>1977 monograph of the Rallidae ; he included Habroptila within the large genus Rallus . This suggestion was , however , not accepted by Gerlof Fokko Mees , <a href='null_relcl' title='2'><mark>who</mark></a>pointed out distinct differences in the shape and structure of the bill . A molecular phylogenetic analysis based on mitochondrial DNA sequence similarity found that Habroptila is part of evolutionary radiation within the broad genus Gallirallus <a href='null_relcl' title='3'><mark>that</mark></a><a href='been_done' title='4'><mark></mark></a> took place around 400 @,@ 000 years ago in the region . 
Dis rail is related to da New Guinea flightless rail , Megacrex inepta , and the chestnut rail , Eulabeornis castaneoventris , alll three Australasian genera prob being derived from Amaurornis ancestors . Storrs Olson argued dat the genus Megacrex was soo similar to Habroptila that Megacrex should b considered a junior synonym of Habroptila , resulting in 2 species in tdagenus . This was further lumped in Sidney Dillon Ripley  1977 monograph of the Rallidae ; he included Habroptila within thdaarge genus Rallus . This suggestion was , however , not accepted by Gerlof Fokko Mees , pointed outt distinct differences in the shape and structure of thedall . A molecular phylogenetic analysis based on mitochondrial DNA sequence similarity found tdatHabroptila is part of evolutionary radiation within the broad genus Gallirallus  done took place around 400 @,@ 000 years ago in the region .