Differs from _Dinornis_, _Palapteryx_ and _Notornis_ in having an articular
surface for a very strong hind toe, and the tarso-metatarsus of a
conformation more nearly resembling that found in the _Dodo_, but shorter
and thicker than in the latter. In addition, the strong calcaneal process,
perforated by a complete bony canal for the tendon at the back part of the
proximal end of the tarso-metatarsus; the perforation above the interspace
between the condyles for the middle and outer toes; and the more posterior
position for the condyle for the inner toe all prove the distinctness of
this genus.
Type: _Aptornis otidiformis_.