Tirsa is a genus of moths of the Crambidae family, containing only one species Tirsa fiona. It is found in French Polynesia (Rapa Iti). The wingspan is 24-28 mm. It is a dark brown moth with dark camouflaging speckles throughout its body. It is also known for its long, narrow antennae, which often extend back over its head, rather than ahead.
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