It belongs to a larger radiation of over 50 species, including the physically different genera Dubautia and Wilkesia.
The species was named after David Steadman in recognition of his contributions to Pacific paleo-ornithology and the understanding of the radiation of Gallirallus-like rails.
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Birds, which were already well established by the end of the Cretaceous, also experienced an adaptive radiation as they took over the skies left empty by the now extinct Pterosaurs.