Species (15.149)
- Avestina ludwigi Aescht & Foissner 1990
- Azerella calva Alekperov 1985
- Baikalodendron angustatum Swarczewsky 1928
- Baikalonis foissneri Jankowski 1982
- Apiosoma baculum Solomatova 1977
- Baikalonis undulata Dons 1918
- Baikalonis gammari Warren 1988
- Baikalophrya digitata Swarczewsky 1928
- Baikalophrya acanthogammari Swarczewsky 1928
- Baikalophrya lobata Swarczewsky 1928
- Baikaloscyphidia anteronis Jankowski 1982
- Baikalotheca cratera Swarczewsky 1930
- Baikalothigma viridis Jankowski 1982
- Bakuella crenata Agamaliev & Alekperov 1976
- Buchneriella criodrili Heidenreich 1935
- Buehringa antarctica Busch 1930
- Buehringa atlantica Busch 1921
- Buetschlia lanceolata -> LB0002: 100
- Buetschlia nana -> LB0002: 100
- Buetschlia neglecta Schuberg 1888
- Buetschlia omnivora -> LB0002: 100
- Buetschliella bovis Jirovec 1933
- Buetschlia triciliata -> LB0002: 100
- Buetschlia parva Schuberg 1888
- Buetschliella opheliae Awerinzew 1908
- Buetschliellopsis commune Lom 1959
- Buetschliellopsis enchytraei Puytorac 1954
- Buetschliellopsis enchytrei Puytorac 1954
- Buetschliellopsis janovicensis Lom 1959
- Buetschliellopsis parumciliata Lom 1954
- Buetschliellopsis torpediniformis Cheissin 1930
- Buissonella tapiri Cunha & Muniz 1925
- Bursaopsis ollula Hada 1970
- Bursaopsis obliqua Claparède & Lachmann 1858
- Bursaopsis quinquealata Laackmann 1907
- Bursaopsis vitrea Brandt 1896
- Bursaopsis striata Daday 1887
- Bursaria arborum
- Bursaria anodontae
- Bursaria ambigua
- Bursaria aurantiaca Ehrenberg 1831
- Bursaria bulla
- Bursaria blattarum Stein 185?
- Bursaria bullina Müller 1786
- Bursaria bursaria
- Bursaria calceolus
- Bursaria chlorostigma Stein
- Bursaria chrysalis
- Bursaria cordiformis Ehrenberg 1838
- Bursaria decora Claparède & Lachmann 1858
- Bursaria cucullio
- Bursaria cuculus
- Bursaria drupella
- Bursaria entozoon Ehrenberg 1838
- Bursaria dubia
- Bursaria duplella
- Bursaria epistomium
- Bursaria fritillus
- Bursaria flava Ehrenberg 1833
- Bursaria hirudinella
- Bursaria hiascens Dumas 1930
- Bursaria globina
- Bursaria hirudinoides
- Bursaria lateritia Ehrenberg 1831
- Balladinopsis nuda Ghosh 1921
- Blepharisma falcatum Gelei 1954
- Blepharisma multinucleatum Dragesco 1960
- Blepharisma roseopersicina Brehm 1948
- Blepharisma salinarum Florentin 1899
- Blepharisma seculum Isquith, Repak & Hirshfield 1965
- Blepharisma semiliformis Isquith 1966
- Blepharisma seshachari Bhandary 1962
- Blepharisma sinosum Sawaya
- Blepharisma sphagni Lepsi 1926
- Blepharisma tardum Kahl 1928
- Blepharisma steini Kahl 1932
- Blepharisma stoltei Isquith 1966 ssp. narai
- Blepharisma tenuis Kahl 1926
- Blepharisma trinodatum Hirshfield, Isquith & Bhandary 1965
- Blepharisma tropicum Seshachar & Bhandary 1962
- Blepharisma undulans Stein 1867
- Blepharisma velatum Vacelet 1961
- Blepharisma vestitum Kahl 1932
- Blepharocodon appendiculatus Bundle 1895
- Bakuella pampinaria Eigner & Foissner 1992
- Bakuella edaphoni Song, Wilbert & Berger 1992
- Balanion comatum Wulff 1919
- Balanion planctonicum Foissner, Oleksiv & Müller 1990
- Balanitozoon agile Stokes 1886
- Balanonema biceps Penard 1922
- Balanonema dubium Penard 1922
- Balanonema sapropelica Foissner 1978
- Balanophrya collaris Kahl 1926
- Balanophrya helenae André 1915
- Balanophrya latericollaris Wang 1930
- Balanophrya mamillata Kahl 1930
- Balanophrya pernix Gelei 1954
- Balantidioides bivacuolata Kahl 1932
- Balantidioides dragescoi Foissner, Adam & Foissner 1982
- Balantidioides muscicola Penard 1922