#Ibero-mesornis  sparrow-sized fossil bird of the Lower Cretaceous having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds
  supertype:  bird  warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
  member of:  genus_Ibero-mesornis  a genus of fossil bird of the subclass Archaeornithes
     member of:  subclass_Archaeornithes__Archaeornithes  primitive reptile-like fossil birds of the Jurassic or early Cretaceous
        member of:  class_Aves__Aves  birds
           member of:  subphylum_Vertebrata__Vertebrata__Craniata__subphylum_Craniata  fishes; amphibians; reptiles; birds; mammals
              member of:  phylum_Chordata__Chordata  comprises true vertebrates and animals having a notochord
                 member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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