Acanthophrya Heidenreich, 1935 (basis of record)
Acanthophrya Heidenreich, 1935 (extant flag source)
Acinetides Swarczewsky, 1928 (extant flag source)
Acinetides Swarczewsky, 1928 (basis of record)
Actinobranchium Jankowski, 1967 (extant flag source)
Actinobranchium Jankowski, 1967 (basis of record)
Actinorhabdos Foissner, 1984 (extant flag source)
Actinorhabdos Foissner, 1984 (basis of record)
Afrothrix Foissner, 1999 (extant flag source)
Afrothrix Foissner, 1999 (basis of record)
Agnathodysteria Deroux, 1976 (extant flag source)
Agnathodysteria Deroux, 1976 (basis of record)
Akidodes Lom, 1959 (basis of record)
Akidodes Lom, 1959 (extant flag source)
Albaretia Affa'a, 1986 (extant flag source)
Albaretia Affa'a, 1986 (basis of record)
Albatrossiella Kofoid & Campbell, 1929 (basis of record)
Albatrossiella Kofoid & Campbell, 1929 (extant flag source)
Allantoxena Yankovskii, 1978 (extant flag source)
Allantoxena Yankovskii, 1978 (basis of record)
Amieta Ngassam & Grain, 1998 (basis of record)
Amieta Ngassam & Grain, 1998 (extant flag source)
Amphileptiscus Song & Bradbury, 1998 (extant flag source)
Amphileptiscus Song & Bradbury, 1998 (basis of record)
Amphorellina Colom, 1948 † (basis of record)
Amplectella Kofoid & Campbell, 1929 (extant flag source)
Amplectella Kofoid & Campbell, 1929 (basis of record)
Amplectellopsis Kofoid & Campbell, 1929 (basis of record)
Amplectellopsis Kofoid & Campbell, 1929 (extant flag source)
Ampullacula Hsiung, 1930 (basis of record)
Ampullacula Hsiung, 1930 (extant flag source)
Ampullofolliculina Hadži, 1951 (extant flag source)
Ampullofolliculina Hadži, 1951 (basis of record)
Amylophorus Pereira & Almeida, 1942 (basis of record)
Amylophorus Pereira & Almeida, 1942 (extant flag source)
Anacharon Ito & Imai, 2000 (basis of record)
Anacharon Ito & Imai, 2000 (extant flag source)
Ancistrella Chejsin, 1930 (extant flag source)
Ancistrella Chejsin, 1930 (basis of record)
Andreula Kahl, 1934 (basis of record)
Andreula Kahl, 1934 (extant flag source)
Anglasia Delphy, 1936 (extant flag source)
Anglasia Delphy, 1936 (basis of record)
Anoplodinium Dogiel, 1927 (extant flag source)
Anoplodinium Dogiel, 1927 (basis of record)
Anthacineta (Collin, 1909) Jankowski, 1978 (extant flag source)
Anthacineta (Collin, 1909) Jankowski, 1978 (basis of record)
Anthochloe Joseph, 1882 (basis of record)
Anthochloe Joseph, 1882 (extant flag source)
Anthurceolaria Jankowski, 1980 (basis of record)
Anthurceolaria Jankowski, 1980 (extant flag source)
Antipia Lepsi, 1927 (extant flag source)
Antipia Lepsi, 1927 (basis of record)
Apoamphisiella Foissner, 1997 (extant flag source)
Apoamphisiella Foissner, 1997 (basis of record)
Apobryophyllum Foissner, 1998 (basis of record)
Apobryophyllum Foissner, 1998 (extant flag source)
Apocolpoda Foissner, 1993 (basis of record)
Apocolpoda Foissner, 1993 (extant flag source)
Arachnodinella Aescht, 2001 (extant flag source)
Arachnodinella Aescht, 2001 (basis of record)
Archinassula Kahl, 1935 (extant flag source)
Archinassula Kahl, 1935 (basis of record)
Arcodiscophrya Jankowski, 1981 (basis of record)
Arcodiscophrya Jankowski, 1981 (extant flag source)
Arcosoma Jankowski, 1967 (basis of record)
Arcosoma Jankowski, 1967 (extant flag source)
Aristerostoma Kahl, 1926 (extant flag source)
Aristerostoma Kahl, 1926 (basis of record)
Armiacineta Yankovskij, 1982 (extant flag source)
Armiacineta Yankovskij, 1982 (basis of record)
Aubertianella Szczechura, 1969 † (basis of record)
Australana Jankowski, 1986 (extant flag source)
Australana Jankowski, 1986 (basis of record)
Avestina Yankovskij, 1980 (extant flag source)
Avestina Yankovskij, 1980 (basis of record)
Azerella Alekperov, 1985 (extant flag source)
Azerella Alekperov, 1985 (basis of record)
Baikalaster Jankowski, 1986 (extant flag source)
Baikalaster Jankowski, 1986 (basis of record)
Baikalocoleps Obolkina, 1995 (basis of record)
Baikalocoleps Obolkina, 1995 (extant flag source)
Baikalodendron Swarczewsky, 1928 (extant flag source)
Baikalodendron Swarczewsky, 1928 (basis of record)
Baikalonis Yankovskij, 1982 (extant flag source)
Baikalonis Yankovskij, 1982 (basis of record)
Baikalophrya Swarczewsky, 1928 (basis of record)
Baikalophrya Swarczewsky, 1928 (extant flag source)
Baikalotheca Jankowski, 1985 (extant flag source)
Baikalotheca Jankowski, 1985 (basis of record)
Baikalothigma Yankovskij, 1982 (basis of record)
Baikalothigma Yankovskij, 1982 (extant flag source)
Balantidioides Penard in Kahl, 1930 (basis of record)
Balantidioides Penard in Kahl, 1930 (extant flag source)
Balantidion Eberland, 1862 (basis of record)
Balantidion Eberland, 1862 (extant flag source)
Balladyna Kowalewsky, 1882 (basis of record)
Balladyna Kowalewsky, 1882 (extant flag source)
Banyulsella Dragesco, 1953 (extant flag source)
Banyulsella Dragesco, 1953 (basis of record)