Oʻahu moa-nalo Temporal range: Holocene
Reconstruction of species’ appearance
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Family:	Anatidae
Genus:	†Thambetochen
Species:	†T. xanion
Binomial name
†Thambetochen xanion Olson & James, 1991

The Oʻahu moa-nalo (Thambetochen xanion) is one of two species of moa-nalo in the genus Thambetochen. Moa-nalo are a group of extinct, flightless, large goose-like ducks, which evolved in the Hawaiian Islands of the North Pacific Ocean.^[1]

The specific epithet comes from the Greek xanion (“comb”), referring to the bony, tooth-like projections on the jaws.^[1]

The species was described in 1991 from subfossil material collected by Storrs Olson, Helen James, Aki Sinoto and Eric Komori, from Barbers Point on the island of Oʻahu. Remains of the bird have also been recovered from Ulupau Head on the same island. It was smaller and less robust than its only congener, the Maui Nui large-billed moa-nalo.^[1]

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