Cimolopteryx (meaning "Cretaceous wing") is a prehistoric bird genus from the late Cretaceous Period. It is currently thought to contain only a single species, Cimolopteryx rara. The only known specimen confidently attributed to C. rara was found in the Lance Formation of Wyoming, dating to the end of the Maastrichtian age, about 66 million years ago.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0