World Register of Marine Species (WoRMS)
Gieysztoria zykovi (Nasonov, 1919) Ruebush & Hayes, 1939
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2026). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Gieysztoria zykovi (Nasonov, 1919) Ruebush & Hayes, 1939. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=480684 on 2026-08-28
Nasonov, N. V. (1919). Contributions to the turbellarian fauna of Russia. IV. Bulletin de l'Académie des Sciences de Russie. 6(12–18): 1179-1197. With one plate.
(Nasonov, 1919) Ruebush & Hayes, 1939