Genus: Guildavis CLARKE, 2004
Etymology: In honor of E. W. Guild, who collected the holotype of Ichthyornis tener and internal specifier, YPM 1760, and Latin, avis, 'bird'.

Species: tener (MARSH, 1880) CLARKE, 2004
= Ichthyornis tener MARSH, 1880
Etymology: Latin, tener, "soft, delicate."

Holotype: YPM 1760

Locality: Smoky Hill River, Wallace County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.


Age: Coniacian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: 2 fragments of a tiny sacrum.

Referred material:

YPM 1738: Humerus.

YPM 1766: Coracoid.