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Temporal range: Late Cretaceous, 70Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Subclass: Hesperornithes
Order: Hesperornithiformes
Genus: Judinornis
Nessov & Borkin, 1983
Species: † J. nogontsavensis
Binomial name
Judinornis nogontsavensis
Nessov & Borkin, 1983

Judinornis is a prehistoric flightless bird genus from the late Cretaceous period. The single known species is Judinornis nogontsavensis. Its fossils have been found in Nemegt Formation rocks of southern Mongolia, and though the age of these deposits is not fully resolved, Judinornis probably lived some 70 million years ago during the early Maastrichtian.

The Nemegt Formation does not seem to contain marine sediments. Consequently and unlike its relatives, this was apparently a bird of estuaries and rivers running from the mountains thrown up by the Cimmerian orogeny through the arid lands of continental East Asia towards the Turgai Sea and the former Shigatze Ocean.[verification needed]

Judinornis was a member of the Hesperornithes, flightless toothed seabirds of the Cretaceous. Though its relationships to other members of this group are inadequately known, it appears to have been one of the more basal hesperornithines.[1]


  1. ^ Mortimer (2004)