†subfamily Nautilornithinae (auk)
Aves - Charadriiformes - Alcoidae
Parent taxon: Alcidae according to O. P. Hay 1930
See also Lambrecht 1933, Wetmore 1940 and Wetmore 1956
Sister taxa: Aethiinae, Alca, Alcinae, Cepphus, Fratercula, Fraterculinae, Mancallinae, Miocepphus, Petralcinae
Subtaxa: Nautilornis
Type: Nautilornis
Ecology: ground dwelling carnivore
Distribution: found only at Green River (Eocene of Utah)