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Temporal range: Late Cretaceous, 75–66 Ma
Left coracoid of a Cimolopteryx rara
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Avialae
Clade: Ornithurae
Family: Cimolopterygidae
Brodkorb, 1963
Type species
Cimolopteryx rara
Marsh, 1892

Cimolopterygidae is an extinct family of ornithurines[2] known from the Late Cretaceous epoch. Remains attributed to cimolopterygids have been found in the Frenchman Formation of Saskatchewan, the Lance Formation of Wyoming, the Fox Hills Formation of Colorado, the Hell Creek Formation of Montana, and the Allen Formation of Rio Negro, Argentina. Most date to the end of the Maastrichtian age, about 66 million years ago, though a much earlier species has also been identified from the Campanian-aged Dinosaur Park Formation of Alberta, about 75 million years ago.[1][3]


  1. ^ a b Federico L. Agnolin (2010). "An avian coracoid from the Upper Cretaceous of Patagonia, Argentina". Stvdia Geologica Salmanticensia. 46 (2): 99–119.
  2. ^ Mohr, Sydney R.; Acorn, John H.; Funston, Gregory F.; Currie, Philip J. (February 2021). "An ornithurine bird coracoid from the Late Cretaceous of Alberta, Canada". Canadian Journal of Earth Sciences. 58 (2): 134–140. doi:10.1139/cjes-2019-0202.
  3. ^ Hope, S. (2002). "The Mesozoic radiation of Neornithes." Pp. 339-388 in Chiappe, L.M. and Witmer, L. (eds.), Mesozoic Birds: Above the Heads of Dinosaurs.