unaccepted ((Karling (1963) mentions Opisthocystis as a subgenus of Polycystis, followed by Artois (2001). However, Sekera (1911) never described it as a subgenus, so the mentioning by Karling (1963) and Artois (2001) as a subgenus is erroneous.))
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2021). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Polycystis (Opisthocystis) goettei. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2021) European Register of Marine Species at: http://marbef.org/data/aphia.php?p=taxdetails&id=155321 on 2024-05-02
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species. Polycystis (Opisthocystis) goettei. Accessed at: https://marbef.org/data/aphia.php?p=taxdetails&id=155321 on 2024-05-02