1. Ibero-mesornis

noun. Sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds.
Synonyms
bird genus Ibero-mesornis
Antonyms
carinate ratite
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2. genus Ibero-mesornis

noun. A genus of fossil bird of the subclass Archaeornithes.
Synonyms
Archaeornithes Ibero-mesornis bird genus subclass Archaeornithes
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