World Register of Marine Species (WoRMS)
Koinocystis sophiae (Graff, 1905) Meixner, 1924
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2026). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Koinocystis sophiae (Graff, 1905) Meixner, 1924. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=155767 on 2026-08-29
Graff, L. von. (1905). Marine Turbellarien Orotavas und der Küsten Europas. II. Rhabdocoela. Zeitschrift fur wissenschaftliche Zoologie. 83: 68-150. With 5 plates.