Itardiornis is an extinct genus of the family Messelornithidae from late Eocene and early Oligocene. Only one species is descript, Itardiornis hessae, from Quercy fissure fillings.
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