Named By: Sterling L. Nesbitt & Julia A. Clarke - 2016.
Classification: Chordata, Aves, Neornithes, Paleognathae, Lithornithiformes, Lithornithidae.
Species: C. grandei (type).
Known locations: USA, Wyoming - Green River Formation.
Time period: Eocene.
Fossil representation: Almost complete, including soft tissue impressions of skin and feathers.
Calciavis is a genus of bird that lived in North America during the Eocene. Calciavis likely foraged upon the ground, though the precise diet is still unknown at the time of writing.
- The anatomy and taxonomy of the exquisitely preserved Green River Formation (early Eocene) lithornithids (Aves) and the relationships of Lithornithidae. - Bulletin of the American Museum of Natural History, no. 406. - Sterling L. Nesbitt & Julia A. Clarke - 2016.
- Estimating Flight Style of Early Eocene Stem Palaeognath Bird Calciavis grandei (Lithornithidae). - The Anatomical Record. - Christopher R. Torres, Mark A.Norell & Julia A. Clarke - 2019.