#genus_Ibero-mesornis  a genus of fossil bird of the subclass Archaeornithes
  supertype:  #bird_genus  a genus of birds
  member of:  #subclass_Archaeornithes
  member:  #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

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