Zhylgaia

Zhylgaia Temporal range: Paleocene
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Phaethontiformes
Genus:	†Zhylgaia Nessov, 1988
Species:	†Z. aestiflua
Binomial name
†Zhylgaia aestiflua Nessov, 1988

Zhylgaia is a genus of fossil bird. Its remains, consisting of two partial humeri, were recovered from an upper Paleocene deposit in Kazakhstan.^[1]

The relationships of this genus are unknown; it was initially placed in the Presbyornithidae, which at that time were believed to be some sort of "transitional shorebird". Upon recognition that the presbyornithids were more likely a prehistoric lineage of fairly advanced waterfowl, Zhylgaia was assigned to the form taxon "Graculavidae", an assemblage of Late Cretaceous and Paleocene shorebirds which are not a natural clade but merely an assemblage of superficially similar birds. All that can be said about this taxon is that it was a modern bird, most likely a neognath.^{[citation needed]}

In 2008, Zhylgaia was assigned to Prophaethontidae—an extinct family related to modern tropicbirds—on the basis of its anatomy and size closely matching the prophaethontid Lithoptila.^[1]