Abollifer prolabens Vørs, 1992 (basis of record)
Acanthamoeba hatchetti Sawyer, Visvesvara & Harke, 1977 (basis of record)
Acanthochrysis echinococcus Conrad, 1931 (basis of record)
Acanthocystis aculeata Hertwig & Lesser, 1874 (basis of record)
Acanthodiacrodium concaviusculum G. Burmann, 1970 † (basis of record)
Acanthoica brevispina Schiller, 1913 (basis of record)
Acanthoica rubus Kamptner, 1941 (basis of record)
Achomosphaera regiensis Corradini, 1972 † (basis of record)
Achradina sulcata Lohmann, 1920 (basis of record)
Acinetactis mirabilis Stokes, 1886 (basis of record)
Actiniscus radicula P. Dumitrica, 1973 (basis of record)
Actiniscus talmadgei D.L. Parke, 1974 (basis of record)
Actinodinium apsteini E. Chatton & T. Hovasse, 1937 (basis of record)
Actinotheca ornata Cookson & Eisenack, 1970 † (basis of record)
Actinotheca rara Corradini, 1972 † (basis of record)
Adnatosphaeridium apenninicum Corradini, 1972 † (basis of record)
Adnatosphaeridium hunickenii Archangelsky, 1969 † (basis of record)
Adorfia firma G. Burmann, 1970 † (basis of record)
Adorfia prolongata G. Burmann, 1970 † (basis of record)
Agalmatoaster septemradiatus Klumpp, 1953 † (basis of record)
Aireiana verrucosa Cookson & Eisenack, 1965 † (basis of record)
Allograpta neofasciata Thompson, 1989 (basis of record)
Amoeba gorgonia Penard, 1902 (basis of record)
Amphidinium mitratum Vozzhennikova, 1967 (basis of record)
Amphitropis aequiciliata Gicklhorn, 1920 accepted as Pteromonas aequiciliata (Gicklhorn) Bourrelly, 1947 (basis of record)
Amphizygus minimus Bukry, 1969 † (basis of record)
Amphizygus papillatus Bukry, 1969 † (basis of record)
Ampullamonas repentes Skvortzov, 1958 (basis of record)
Ampullamonas rotante Skvortzov, 1958 (basis of record)
Angulomonas stagnalis Skvortzov, 1968 (basis of record)
Angulomonas triquetra Skvortzov, 1968 (basis of record)
Anisonema acutum Skvortzov, 1932 (basis of record)
Anisonema hexagonale Christen, 1958 (basis of record)
Anisonema minus Sandon, 1924 (basis of record)
Anisonema multicostatum K. Möbius, 1888 (basis of record)
Anisonema naupliorum Michajlow, 1969 (basis of record)
Anisonema trepidum Larsen, 1987 (basis of record)
Anomaloplaisium lumariacuspis H. Tappan & A.R. Loeblich Jr., 1971 † (basis of record)
Anomaloplaisium tappaniae F. Cramer & Díez, 1977 † (basis of record)
Anthocharis caliente Wright, 1905 (basis of record)
Anthosphaeridium convolvuloides Cookson & Eisenack, 1968 † (basis of record)
Arbusculidium gratiosum F. Cramer & Díez, 1977 † (basis of record)
Arbusculidium sutile F. Cramer & Díez, 1977 † (basis of record)
Archaeomonas bizonata Deflandre, 1938 † (basis of record)
Archaeomonas edwardsii Perch-Nielsen, 1975 † (basis of record)
Artisphaeridium fragile H. Stradner in M. Hajós & H. Stradner, 1975 † (basis of record)
Artoriopsis klausi Framenau, 2007 (basis of record)
Ascodinium ovalis Cookson & Eisenack, 1970 † (basis of record)
Aspidiophora viridissima Sjöstedt, 1925 (basis of record)
Aspidisca marsupialis Penard, 1921 (basis of record)
Astasia agilis H.R. Christen, 1960 (basis of record)
Astasia bacillifera H.R. Christen, 1960 (basis of record)
Astasia chaetogastris M. Codreanu & R. Codreanu, 1928 (basis of record)
Astasia clava E.G. Pringsheim, 1942 (basis of record)
Astasia coelomae W. Michajlow, 1967 (basis of record)
Astasia concinna H.R. Christen, 1959 (basis of record)
Astasia cyclopis W. Michajlow, 1956 (basis of record)
Astasia edax H.R. Christen, 1959 accepted as Euglenopsis edax (H.R. Christen) G.F. Leedale (basis of record)
Astasia falcata Skvortzov, 1958 (basis of record)
Astasia gracilis Z.I. Vetrova, 1977 (basis of record)
Astasia hanoiensis W. Michajlow, 1964 (basis of record)
Astasia helvetica W. Michajlow, 1967 (basis of record)
Astasia linealis E.G. Pringsheim, 1942 (basis of record)
Astasia norvegica W. Michajlow, 1964 (basis of record)
Astasia ovorum W. Michajlow, 1965 (basis of record)
Astasia recta H.R. Christen, 1960 (basis of record)
Astasia serpens E.G. Pringsheim, 1956 (basis of record)
Astasia skadowskii Korshikov, 1929 (basis of record)
Astasia taeniata H.R. Christen, 1960 (basis of record)
Astasia truncata D. Sokoloff, 1934 (basis of record)
Astasia vulgaris H.R. Christen, 1960 (basis of record)
Astasiella velox W. Michajlow, 1964 (basis of record)
Astrionis segmentis Wilcoxon, 1972 † (basis of record)
Ataxiodinium choanum Reid, 1974 † (basis of record)
Atelodinium parasiticum Chatton, 1920 (basis of record)
Atractonema pusilla Stokes, 1888 (basis of record)
Australopithecus anamensis Leakey, Feibel, McDougall & Walker, 1995 † (basis of record)
Baikowia ferox Skvortzov, 1958 (basis of record)
Balteocysta rotula L.E. Stover & W.R. Evitt, 1978 † (basis of record)
Baltisphaera ternata G. Burmann, 1970 † (basis of record)
Baltisphaeridium apertum G. Burmann, 1970 † (basis of record)
Baltisphaeridium bifidum Clarke & Verdier, 1967 † (basis of record)
Baltisphaeridium heinzelinii F. Stockmans & Y. Willière, 1969 † (basis of record)
Baltisphaeridium kahleri Bachmann & Schmid, 1964 † (basis of record)
Baltisphaeridium ligospinosum De Coninck, 1968 † (basis of record)
Baltisphaeridium rakoae F. Stockmans & Y. Willière, 1969 † (basis of record)
Baltisphaeridium severinii Cookson & Cranwell, 1967 † (basis of record)
Baltisphaeridium tentaculaferum F. Martin, 1967 † (basis of record)
Baltisphaeridium varispinosum W.A.S. Sarjeant, 1959 † (basis of record)
Batillipes caudatus W.P. Hay, 1917 accepted as Batillipes mirus Richters, 1909 (basis of record)
Bicarinellum tricarinelloides Versteegh, 1993 † (basis of record)
Bicoeca planktonica Kiselev, 1931 (basis of record)
Bidiscus bifrons M. Black, 1972 † (basis of record)
Bidiscus bramlettei M. Black, 1972 † (basis of record)
Bidiscus canthus Wilcoxon, 1972 † (basis of record)
Bidiscus cuneatus N. Hoffmann, 1970 † (basis of record)
Bidiscus gorkae M. Black, 1971 † (basis of record)
Bidiscus hintonensis M. Black, 1972 † (basis of record)
Bidiscus monocavus Bukry, 1969 † (basis of record)
Bidiscus rotatorius Bukry, 1969 † (basis of record)