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Zhylgaia
''Zhylgaia'' is a genus of birds known only from fossils. Its remains have been recovered from a Late Cretaceous or Paleogene deposit in Central Asia. The relationships of this form are unknown; it was initially placed in the Presbyornithidae, which at that time were believed to be some sort of "transitional shorebird". Recognizing that the presbyornithids were actually 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 outwardly similar birds. All that can be said about this taxon is that it was a modern bird, in all probability a neognathe. ==References==
* Nesov, L. A. (1988): (Birds from the Cretaceous and Paleogene of Central Asia and Kazakhstan and Natural Conditions in Their Habitats ). ''Trudy Zoologicheskogo Instituta Akademii Nauk SSSR'' 182: 116-123. (in Russian )
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