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|Noun||1.||genus Ibero-mesornis - a genus of fossil bird of the subclass Archaeornithes|
bird genus - a genus of birds
Archaeornithes, subclass Archaeornithes - primitive reptile-like fossil birds of the Jurassic or early Cretaceous
Ibero-mesornis - sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds