Aglaiocypris enigmatica (Keij, 1957) Apostolescu, 1964 † (original description)
Argilloecia jeurrensis Keij, 1957 † (original description)
Aulocytheridea faboides (Bosquet, 1852) Keij, 1957 † (new combination reference)
Aulocytheridea faboides faboides (Bosquet, 1852) Keij, 1957 † (new combination reference)
Aulocytheridea tavernieri Keij, 1957 † (original description)
Bairdoppilata gliberti Keij, 1957 † (original description)
Boldella Keij, 1957 † (original description)
Boldella deldenensis Keij, 1957 † (original description)
Bosquetina Keij, 1957 † (original description)
Bosquetina dentata (Müller, 1894) (new combination reference)
Bosquetina dentata dentata (Müller, 1894) Keij, 1957 (new combination reference)
Bosquetina pectinata (Bosquet, 1852) Keij, 1957 † (new combination reference)
Bosquetina tarentina (Baird, 1850) (new combination reference)
Brachycythere nalinnesensis Keij, 1957 † (original description)
Bradleya approximata (Bosquet, 1852) † (new combination reference)
Bradleya approximata approximata (Bosquet, 1852) † (new combination reference)
Bythocypris cuisensis Keij, 1957 † (original description)
Clithrocytheridea lerichei Keij, 1957 † (original description)
Costa edwardsii edwardsii (Roemer, 1838) Keij, 1957 † (new combination reference)
Costa edwardsii padana (Ruggieri, 1950) † (new combination reference)
Cuneocythere (Cuneocythere) lienenklausi Keij, 1957 † represented as Cuneocythere lienenklausi Keij, 1957 † (original description)
Cuneocythere (Cuneocythere) marginata (Bosquet, 1852) Keij, 1957 † (new combination reference)
Cuneocythere (Cuneocythere) marginata marginata (Bosquet, 1852) Keij, 1957 † (new combination reference)
Cuneocythere (Monsmirabilia) Apostolescu, 1955 † (new combination reference)
Cuneocythere (Monsmirabilia) foveolata (Bosquet, 1852) Keij, 1957 † represented as  † (new combination reference)
Cuneocythere (Monsmirabilia) oblonga (Apostolescu, 1955) Keij, 1957 † (new combination reference)
Cuneocythere (Monsmirabilia) subovata (Apostolescu, 1955) Keij, 1957 † (new combination reference)
Cuneocythere lienenklausi Keij, 1957 † (original description)
Cuneocythere marginata (Bosquet, 1852) Keij, 1957 † (new combination reference)
Cuneocythere marginata marginata (Bosquet, 1852) Keij, 1957 † (new combination reference)
Cushmanidea grosjeani (Keij, 1957) Apostolescu, 1964 † (original description)
Cushmanidea grosjeani (Keij, 1957) Ducasse & Vigneaux, 1961 † (original description)
Cyprideis (Goerlichia) Keij, 1957 (original description)
Cypridina homoedhardsiana (Keij, 1957) Mckenzie et al., 1979 † (original description)
Cypridina homoedwardsiana Keij, 1957 † represented as Cypridina homoedhardsiana (Keij, 1957) Mckenzie et al., 1979 † (original description)
Cytheretta bambruggensis Keij, 1957 † (original description)
Cytheretta eocaenica Keij, 1957 † (original description)
Cytheretta laticosta (Reuss, 1850) Keij, 1957 † (new combination reference)
Cytheridea intermedia (Reuss, 1850) Keij, 1957 † (new combination reference)
Cytheromorpha brabantica Keij, 1957 † (original description)
Cytheropteron (Cytheropteron) gulincki Keij, 1957 † represented as Cytheropteron gulincki Keij, 1957 † (original description)
Cytheropteron gulincki Keij, 1957 † (original description)
Echinocythereis hispida (Speyer, 1863) Keij, 1957 † (new combination reference)
Eopaijenborchella Keij, 1957 † (original description)
Eucytherura hyonensis Keij, 1957 † (original description)
Falunia plicatula (Reuss, 1850) Keij, 1957 † (new combination reference)
Falunia plicatula plicatula (Reuss, 1850) Keij, 1957 † (new combination reference)
Haplocytheridea punctatella (Bosquet, 1852) Keij, 1957 † (new combination reference)
Haplocytheridea punctatella punctatella (Bosquet, 1852) Keij, 1957 † (new combination reference)
Hemicytherideis grosjeani Keij, 1957 † (original description)
Hermanites grosjeani (Keij, 1957) Apostolescu, 1964 † (original description)
Kingmaina Keij, 1957 † (original description)
Kingmaina cristata (Bosquet, 1854) Keij, 1957 † (new combination reference)
Kingmaina forbesiana (Bosquet, 1852) † (new combination reference)
Kingmaina hagenowi (Bosquet, 1854) Keij, 1957 † (new combination reference)
Kingmaina macroptera (Bosquet, 1854) Keij, 1957 † (new combination reference)
Kingmaina minutoidea (Veen, 1936) Keij, 1957 † (new combination reference)
Leguminocythereis dumonti Keij, 1957 † (original description)
Leguminocythereis genappensis Keij, 1957 † (original description)
Loxoconcha curryi Keij, 1957 † (original description)
Loxoconcha kuiperi Keij, 1957 † (original description)
Loxoconcha nystiana (Bosquet, 1852) Keij, 1957 † (new combination reference)
Loxoconcha subtriangularis (Speyer, 1863) Keij, 1957 † (new combination reference)
Neocyprideis apostolescui (Keij, 1957) † (original description)
Paleomonsmirabilia triebeli triebeli (Keij, 1957) Apostolescu, 1964 † (original description)
Paracypris contracta (Jones, 1857) Keij, 1957 † (new combination reference)
Paracytheridea (Paracytheridea) brusselensis Keij, 1957 † represented as Paracytheridea brusselensis Keij, 1957 † (original description)
Paracytheridea brusselensis Keij, 1957 † (original description)
Pontocythere grosjeani (Keij, 1957) † (original description)
Pterygocythereis fimbriata bartonensis (Keij, 1957) † (original description)
Pterygocythereis spinigera (Keij, 1957) Apostolescu, 1964 † (original description)
Pterygocythereis tuberosa Keij, 1957 † (original description)
Quadracythere orbignyana (Bosquet, 1852) † (new combination reference)
Ruggieria Keij, 1957 (original description)
Ruggieria (Ruggieria) Keij, 1957 † (original description)
Ruggieria (Ruggieria) micheliniana (Bosquet, 1852) Keij, 1957 † represented as Ruggieria micheliniana (Bosquet, 1852) Keij, 1957 † (new combination reference)
Ruggieria micheliniana (Bosquet, 1852) Keij, 1957 † (new combination reference)
Schizocythere batjesi Keij, 1957 † (original description)
Semicytherura bambruggensis Keij, 1957 † (original description)
Semicytherura oedelemensis oedelemensis (Keij, 1957) Moos, 1971 † (original description)
Trachyleberis (Trachyleberis) arachnoidea (Bosquet, 1852) Keij, 1957 † represented as Trachyleberis arachnoidea (Bosquet, 1852) Keij, 1957 † (new combination reference)
Trachyleberis (Trachyleberis) echinata (Reuss, 1851) Keij, 1957 † represented as  † (new combination reference)
Trachyleberis arachnoidea (Bosquet, 1852) Keij, 1957 † (new combination reference)
Trachyleberis echinata elongata (Lienenklaus, 1894) † (new combination reference)