Acanthophrya Heidenreich, 1935 (extant flag source)
Acanthophrya Heidenreich, 1935 (basis of record)
Acinetides Swarczewsky, 1928 (basis of record)
Acinetides Swarczewsky, 1928 (extant flag source)
Actinobranchium Jankowski, 1967 (basis of record)
Actinobranchium Jankowski, 1967 (extant flag source)
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 (basis of record)
Agnathodysteria Deroux, 1976 (extant flag source)
Akidodes Lom, 1959 (basis of record)
Akidodes Lom, 1959 (extant flag source)
Albaretia Affa'a, 1986 (basis of record)
Albaretia Affa'a, 1986 (extant flag source)
Albatrossiella Kofoid & Campbell, 1929 (extant flag source)
Albatrossiella Kofoid & Campbell, 1929 (basis of record)
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 (basis of record)
Amplectella Kofoid & Campbell, 1929 (extant flag source)
Amplectellopsis Kofoid & Campbell, 1929 (extant flag source)
Amplectellopsis Kofoid & Campbell, 1929 (basis of record)
Ampullacula Hsiung, 1930 (basis of record)
Ampullacula Hsiung, 1930 (extant flag source)
Ampullofolliculina Hadži, 1951 (basis of record)
Ampullofolliculina Hadži, 1951 (extant flag source)
Amylophorus Pereira & Almeida, 1942 (extant flag source)
Amylophorus Pereira & Almeida, 1942 (basis of record)
Anacharon Ito & Imai, 2000 (basis of record)
Anacharon Ito & Imai, 2000 (extant flag source)
Ancistrella Chejsin, 1930 (basis of record)
Ancistrella Chejsin, 1930 (extant flag source)
Andreula Kahl, 1934 (extant flag source)
Andreula Kahl, 1934 (basis of record)
Anglasia Delphy, 1936 (basis of record)
Anglasia Delphy, 1936 (extant flag source)
Anoplodinium Dogiel, 1927 (extant flag source)
Anoplodinium Dogiel, 1927 (basis of record)
Anthacineta (Collin, 1909) Jankowski, 1978 (basis of record)
Anthacineta (Collin, 1909) Jankowski, 1978 (extant flag source)
Anthochloe Joseph, 1882 (extant flag source)
Anthochloe Joseph, 1882 (basis of record)
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 (basis of record)
Apoamphisiella Foissner, 1997 (extant flag source)
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 (extant flag source)
Arcodiscophrya Jankowski, 1981 (basis of record)
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 (basis of record)
Australana Jankowski, 1986 (extant flag source)
Avestina Yankovskij, 1980 (basis of record)
Avestina Yankovskij, 1980 (extant flag source)
Azerella Alekperov, 1985 (basis of record)
Azerella Alekperov, 1985 (extant flag source)
Baikalaster Jankowski, 1986 (basis of record)
Baikalaster Jankowski, 1986 (extant flag source)
Baikalocoleps Obolkina, 1995 (basis of record)
Baikalocoleps Obolkina, 1995 (extant flag source)
Baikalodendron Swarczewsky, 1928 (basis of record)
Baikalodendron Swarczewsky, 1928 (extant flag source)
Baikalonis Yankovskij, 1982 (basis of record)
Baikalonis Yankovskij, 1982 (extant flag source)
Baikalophrya Swarczewsky, 1928 (extant flag source)
Baikalophrya Swarczewsky, 1928 (basis of record)
Baikalotheca Jankowski, 1985 (extant flag source)
Baikalotheca Jankowski, 1985 (basis of record)
Baikalothigma Yankovskij, 1982 (extant flag source)
Baikalothigma Yankovskij, 1982 (basis of record)
Balantidioides Penard in Kahl, 1930 (extant flag source)
Balantidioides Penard in Kahl, 1930 (basis of record)
Balantidion Eberland, 1862 (extant flag source)
Balantidion Eberland, 1862 (basis of record)
Balladyna Kowalewsky, 1882 (basis of record)
Balladyna Kowalewsky, 1882 (extant flag source)
Banyulsella Dragesco, 1953 (extant flag source)
Banyulsella Dragesco, 1953 (basis of record)