Protoperidinium Bergh, 1881 (additional source)
Protoperidinium adeliense (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium affine (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium antarcticum (Schimper ex Karsten) Balech, 1974 (new combination reference)
Protoperidinium applanatum (Mangin) Balech, 1974 (new combination reference)
Protoperidinium archiovatum (Balech) Balech, 1974 (new combination reference)
Protoperidinium areolatum (Peters, 1928) Balech, 1974 (new combination reference)
Protoperidinium bellulum (Balech, 1971) Balech, 1974 (new combination reference)
Protoperidinium bipatens Balech, 1973 (additional source)
Protoperidinium charcoti (Balech, 1958) Balech, 1974 accepted as
Protoperidinium charcotii (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium charcotii (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium concavum (Mangin) Balech, 1974 (new combination reference)
Protoperidinium crassipes (Kofoid, 1907) Balech, 1974 (new combination reference)
Protoperidinium cruciferum (Balech, 1971) Balech, 1973 (new combination reference)
Protoperidinium curtum (Balech, 1958) Balech, 1973 (additional source)
Protoperidinium defectum (Balech, 1965) Balech, 1974 (new combination reference)
Protoperidinium elegantissimum (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium glyptopterum Balech, 1973 (additional source)
Protoperidinium granii (Ostenfeld) Balech, 1974 (new combination reference)
Protoperidinium incertum (Balech) Balech, 1973 (additional source)
Protoperidinium incognitum (Balech, 1959) Balech, 1974 (new combination reference)
Protoperidinium latistriatum (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium longipes Balech, 1974 (original description)
Protoperidinium mediocre (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium melo (Balech, 1971) Balech, 1974 (new combination reference)
Protoperidinium metananum (Balech, 1965) Balech, 1974 (new combination reference)
Protoperidinium penitum (Balech, 1971) Balech, 1974 (new combination reference)
Protoperidinium rosaceum (Balech, 1958) Balech, 1974 (new combination reference)
Protoperidinium thulesense (Balech) Balech, 1974 (new combination reference)
Protoperidinium unipes (Balech, 1962) Balech, 1974 (new combination reference)