Furcula occidentalis. Schintlmeister (2008) treated F. occidentalis as a subspecies of the European F. furcula (Clerck, 1758), but F. occidentalis was elevated back to species status by Schmidt & Anweiler (2010a). The genus is in need of revision.

• Schintlmeister A (2008) Palaearctic Macrolepidoptera. Volume 1. Notodontidae. Apollo Books, Stenstrup, Denmark. 482 pp.
• Schmidt BC, Anweiler GG (2010a) Taxonomic changes to Lepidoptera: Macro-moths. In: Pohl GR, Anweiler GG, Schmidt BC, Kondla NG. An annotated list of the Lepidoptera of Alberta, Canada. ZooKeys 38: 497-509.