This species is described from six fossils recovered from a Holocene rockshelter deposit on Mangaia. The coracoid and carpometacarpus of the new species, are larger and very different qualitatively from those of the Atiu species.
This species was closely allied with the extant Atiu Swiftlet (Aerodramus sawtelli) of 'Atiu, Mangaia's neighboring island. The Mangaia Swiftlet was probably slightly larger.
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