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A re-examination of the moa genus
Megalapteryx reveals that the two currently accepted species,
M. didinus (Owen) and
M. benhami Archey, do not differ in the shape of the bones. They represent small and large specimens in an unbroken size continuum. Specimens from northwest Nelson have a larger mean size than those in a sample from Takahe Valley, Fiordland. A series of 14C dates indicates that the largest ‘
M. benhami‘ are all of Otiran derivation, whereas
M. didinus bones are from Otiran and Holocene deposits. Therefore
M. benhami is synonymised with the upland moa,
M. didinus (Owen).