Zhylgaia is a genus of fossil bird. Its remains, consisting of two partial humeri, were recovered from an upper Paleocene deposit in Kazakhstan.[1]
| Zhylgaia Temporal range: Paleocene
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Phaethontiformes |
| Genus: | †Zhylgaia Nessov, 1988 |
| Species: | †Z. aestiflua
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| Binomial name | |
| †Zhylgaia aestiflua Nessov, 1988
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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]
References edit
- ^ a b Bourdon, Estelle; Mourer-Chauviré, Cécile; Amaghzaz, Mbarek; Bouya, Baâdi (2008-09-12). "New specimens of Lithoptila abdounensis (Aves, Prophaethontidae) from the lower Paleogene of Morocco". Journal of Vertebrate Paleontology. 28 (3): 751–761. doi:10.1671/0272-4634(2008)28[751:NSOLAA]2.0.CO;2. ISSN 0272-4634.
- Nessov, L. A. (1988): [New 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. [Article in Russian]
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