| NOUN | animal | Archaeornithes, subclass Archaeornithes | primitive reptile-like fossil birds of the Jurassic or early Cretaceous |
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| Meaning | Primitive reptile-like fossil birds of the Jurassic or early Cretaceous. | |
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| Synonym | subclass Archaeornithes | |
| Member of | Aves, class Aves | (ornithology) the class of birds |
| Members | genus Archaeopteryx, genus Archeopteryx | A genus of fossil birds |
| genus Archaeornis | A genus of fossil bird | |
| genus Ibero-mesornis | A genus of fossil bird of the subclass Archaeornithes | |
| genus Sinornis | A genus of fossil birds | |
| Broader | class | (biology) a taxonomic group containing one or more orders |
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