Ianussiusa is a genus of butterflies in the Nymphalidae family. It contains only one species, Ianussiusa maso, which is found in Colombia and Venezuela.
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