Qinornis
| Qinornis Temporal range:Paleocene,
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|---|---|
Scientific classification
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | Avialae |
| Clade: | Ornithuromorpha |
| Clade: | Ornithurae |
| Genus: | †Qinornis Xue, 1995 |
| Species: | †Q. paleocenica
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| Binomial name | |
| †Qinornis paleocenica Xue, 1995
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Qinornisis agenusofextinctavialansfrom the early-mid-Paleoceneepoch (lateDanianage), about 61 millionyearsago. It is known from a single fossil specimen consisting of a partial hind limb and foot, which was found inFangou Formationdeposits inLuonan County,China.
The bones show uniquely primitive characteristics for its age, and its describer considered that it was either a juvenile of a modernbirdgroup or, if an adult, the only known non-neornithine bird to have survived theCretaceous–Paleogene extinction event.[1]Unusually for such a recent bird, the bones of the foot are not completely fused to one another. This characteristic is found in juvenile modern birds, and in adults of more primitive, non-neornithean ornithurine birds, all of which were assumed to have become extinct in theCretaceous–Paleogene extinction event, despite a sparse late-Maastrichtianfossil record limited primarily to North America.[2]In 2007,Mayrexamined the bones and concluded that they represented an adult, and probably did come from a non-neornithine bird similar toApsaravis.[2]
Longrich and colleagues (2011) noted that it was not impossible for some "archaic" birds to have persisted beyond the Cretaceous period for some time, and that this did not invalidate the hypothesis that birds experienced a mass extinction event at the end of theMesozoic.[3][failed verification]
References
[edit]- ^Xue, (1995). "Qinornis paleocenica- a Paleocene bird discovered in China. "Courier Forschungsinstitut Senckenberg,181:89-93.
- ^abMayr G., (2007). "The birds from the Paleocene fissure filling of Walbeck (Germany)."Journal of Vertebrate Paleontology,27(2): 394-408.PDF fulltext.doi:10.1671/0272-4634(2007)27[394:TBFTPF2.0.CO;2]
- ^Longrich, N.R., Tokaryk, T. and Field, D.J. (2011). "Mass extinction of birds at the Cretaceous–Paleogene (K–Pg) boundary."Proceedings of the National Academy of Sciences,108(37): 15253-15257.doi:10.1073/pnas.1110395108
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