| Ichthyornitheans Temporal range: Late Cretaceous,
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| Cast of an Ichthyornis dispar skeleton, Rocky Mountain Dinosaur Resource Center | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | Avialae |
| Clade: | Ornithurae |
| Clade: | †Ichthyornithes Marsh, 1873 |
| Subgroups[2] | |
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And see text | |
| Synonyms | |
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Ichthyornithiformes Furbringer, 1888[2] | |
Ichthyornithes is an extinct group of toothed avialan dinosaurs very closely related to the common ancestor of all modern birds. They are known from fossil remains found throughout the late Cretaceous period of North America, though only two genera, Ichthyornis and Janavis, are represented by complete enough fossils to have been named. Ichthyornitheans became extinct at the Cretaceous–Paleogene boundary, along with enantiornitheans, all other non-avian dinosaurs, and many other animal and plant groups.
- ^ Benito, J.; Kuo, P.-C.; Widrig, K. E.; Jagt, J. W. M.; Field, D. J. (2022). "Cretaceous ornithurine supports a neognathous crown bird ancestor". Nature. 612 (7938): 100–105. doi:10.1038/s41586-022-05445-y. PMID 36450906. S2CID 254099216.
- ^ a b Cite error: The named reference
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