Oiophassus is an extinct genus of moth in the Hepialidae family. It contains only one species, Oiophassus nycterus, which was described from Shanwang Bed sw2 in the Linchu district, Shantung province in China, which is part of an Astaracian lacustrine sandstone/mudstone in the Shanwang Formation.
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