Peridinium achromaticum Levander, 1902 accepted as Protoperidinium achromaticum (Levander) Balech, 1974 (additional source)
Peridinium quinquecorne T.H.Abé, 1927 accepted as Peridinium quadridentatum (F.Stein) Gert Hansen, 1995 (additional source)
Protoperidinium Bergh, 1881 (additional source)
Protoperidinium achromaticum (Levander) Balech, 1974 (new combination reference)
Protoperidinium antarcticum (Schimper ex Karsten) Balech, 1974 (new combination reference)
Protoperidinium avellana (Meunier, 1919) Balech, 1974 (new combination reference)
Protoperidinium bipes (Paulsen, 1904) Balech, 1974 (new combination reference)
Protoperidinium brevipes (Paulsen, 1908) Balech, 1974 (new combination reference)
Protoperidinium cerasus (Paulsen, 1907) Balech, 1973 (additional source)
Protoperidinium claudicans (Paulsen, 1907) Balech, 1974 (new combination reference)
Protoperidinium conicoides (Paulsen) Balech, 1973 (new combination reference)
Protoperidinium conicum (Gran) Balech, 1974 (new combination reference)
Protoperidinium crassipes (Kofoid, 1907) Balech, 1974 (new combination reference)
Protoperidinium curtipes (Jørgensen, 1912) Balech, 1974 (new combination reference)
Protoperidinium curvipes (Ostenfeld) Balech, 1974 (new combination reference)
Protoperidinium denticulatum (Gran & Braarud, 1935) Balech, 1974 (new combination reference)
Protoperidinium depressum (Bailey, 1854) Balech, 1974 (new combination reference)
Protoperidinium diabolus (Cleve, 1900) Balech, 1974 (new combination reference)
Protoperidinium divergens (Ehrenberg) Balech, 1974 (new combination reference)
Protoperidinium excentricum (Paulsen, 1907) Balech, 1974 (new combination reference)
Protoperidinium inflatum (Okamura, 1912) Balech, 1974 (new combination reference)
Protoperidinium leonis (Pavillard, 1916) Balech, 1974 (new combination reference)
Protoperidinium minutum (Kofoid) Loeblich III, 1970 accepted as Archaeperidinium minutum (Kofoid) Jørgensen, 1912 (additional source)
Protoperidinium mite (Pavillard, 1916) Balech, 1974 (new combination reference)
Protoperidinium nudum (Meunier, 1919) Balech, 1974 (new combination reference)
Protoperidinium oceanicum (VanHöffen, 1897) Balech, 1974 (new combination reference)
Protoperidinium ovatum Pouchet, 1883 (additional source)
Protoperidinium pallidum (Ostenfeld, 1899) Balech, 1973 (additional source)
Protoperidinium pellucidum Bergh, 1882 (additional source)
Protoperidinium pentagonum (Gran, 1902) Balech, 1974 (new combination reference)
Protoperidinium punctulatum (Paulsen, 1907) Balech, 1974 (new combination reference)
Protoperidinium pyriforme (Paulsen, 1905) Balech, 1974 (new combination reference)
Protoperidinium quinquecorne (Abé, 1927) Balech, 1974 accepted as Peridinium quadridentatum (F.Stein) Gert Hansen, 1995 (new combination reference)
Protoperidinium steinii (Jørgensen, 1899) Balech, 1974 (new combination reference)
Protoperidinium subinerme (Paulsen) Loeblich III, 1969 (additional source)
Protoperidinium thorianum (Paulsen, 1905) Balech, 1973 (new combination reference)
Protoperidinium tuba (Schiller) Balech, 1974 (new combination reference)