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Primitive reptile-like fossil birds of the Jurassic or early Cretaceous
Answer for the clue "Primitive reptile-like fossil birds of the Jurassic or early Cretaceous ", 14 letters:
archaeornithes
Word definitions for archaeornithes in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Archaeornithes \Archaeornithes\ n. 1. 1 a subclass of primitive reptilelike fossil birds of the Jurassic or early Cretaceous. Syn: subclass Archaeornithes
Wikipedia
Word definitions in Wikipedia
The Archaeornithes , classically Archæornithes , is an extinct group of the first primitive, reptile-like birds . It is an evolutionary grade of transitional fossils , the primitive birds halfway between dinosaur ancestors and the derived modern birds. ...