Species (15.149)
- Metopus bothrostoma Mermod
- Metopus brachoni Fenchel 1968
- Metopus bothrostomiformis Foissner 1980
- Metopus campanula Kahl 1932
- Metopus caducus Kahl 1927
- Metopus contractus Penard 1922
- Metopus circumlabens Biggar & Wenrich 1932
- Metopus curvatus Kahl 1927
- Metopus convexus Kahl 1927
- Metopus cydonia Kahl 1927
- Metopus cuspidatus Penard ?
- Metopus daphanides Jankowski 1964
- Metopus darwini Kahl 1927
- Metopus daphnides Jankowski 1964
- Metopus denarius Kahl 1932
- Metopus entorhipidioides Jankowski 1964
- Metopus dentatus Kahl 1932
- Metopus extensus Kahl 1926
- Metopus es Müller 1776
- Metopus fastigatus Kahl 1927
- Metopus halophilus Kahl 1928
- Metopus fuscus Kahl 1927
- Metopus intercedens Kahl 1927
- Metopus hyalinus Kahl 1932
- Metopus rectus Kahl 1932
- Metopus ridiculus Kahl 1927
- Metopus rostratus Kahl 1926
- Metopus rotundus Scott Lucas 1934
- Metopus sapropelicus Tucolesco 1962
- Metopus sigmoides Claparède & Lachmann 1858
- Loxophyllum unecostatum Lepsi 1962
- Loxophyllum variable Dragesco 1954
- Madsenia indomita Madsen 1931
- Malacophrys rotans Kahl 1926
- Malacophrys sphagni Penard 1922
- Malacosoma intestinale Kopperi 1935
- Maryna acuminata Gellert 1955
- Maryna antarctica Foissner 1993
- Maryna cardioides Gelei 1950
- Maryna atra Gelei 1950
- Maryna galeata Gelei 1950
- Maryna grisea Gelei 1950
- Maryna hyalina Dingfelder 1962
- Mesodinium phialinum Maskell 1887
- Mesodinium pulex Claparède & Lachmann 1859
- Mesodinium pupulum Kahl 1933
- Mesodinium recurva Kellicott 1885
- Mesodiscophrya steinii Claparède & Lachmann 1859
- Mesolembus fecalis Small & Lynn 1985
- Mesothamnium hiketes Precht 1935
- Metacineta acuminata Stokes 1887
- Metacineta bütschlii Kann 1933
- Metacineta cuspidata Kellicott 1885
- Metacineta macrocaulis Stokes 1887
- Metacineta micraster Penard 1914
- Metacineta longipes Mereschkowsky 1879
- Metacollinia orchestiae Puytorac & Grain 1975
- Metacylis pontica Mereschkowsky 1880
- Balladyna elongata Roux 1901
- Balladyna ovata Tagliani 1922
- Balladyna fusiformis Kahl 1932
- Balladyna similis Kahl 1932
- Balladyna parvula Kowalewski 1882
- Balladynopsis nuda Ghosh 1921
- Balladynella fusiformis Stiller 1974
- Balladyna viridis
- Ballodora dimorpha Dogiel & Furssenko 1921
- Ballodora marceli Remy 1928
- Banyulsella viridis Dragesco 1954
- Baranella gracilis Nagy 1989
- Bardeliella pulchra Foissner 1984
- Basitokophrya ornata Gajewskaja 1933
- Beckmania baikalensis Jankowski 1982
- Belonophrya pelagica André 1914
- Benedenia coronata Foettinger 1881
- Benedenia elegans Foettinger 1881
- Phialina muscicola Kahl 1943
- Bezedniella prima Stloukal & Matis 1994
- Bertolinella intestinalis Carpano 1941
- Birojima muscorum Kahl 1932
- Birojima terricola Berger & Foissner 1989
- Bizone parva Lepsi 1926
- Bizonula parva Corliss 1960
- Blepharisma albicans Dumas 1937
- Blepharisma botezati Lepsi 1926
- Blepharisma bimicronucleatum Villeneuve-Brachon 1940
- Blepharisma biancae Lepsi 1948
- Blepharisma americanum Suzuki 1954
- Blepharisma bothrostoma Stokes 1887
- Blepharisma brevifiliformis Isquith 1966
- Blepharisma candidum Yagiu & Shigenaka 1956
- Blepharisma caudatus Dumas 1937
- Blepharisma clarissimum Anigstein 1912
- Blepharisma coeruleum Gajewskaja 1927
- Blepharisma dileptus Kahl 1928
- Blepharisma elegans Vuxanovici 1963
- Blepharisma elongatum Stokes 1884
- Blepharisma fusiforme Vuxanovici 1963
- Blepharisma galianoi Fernandez-Leborans 1979
- Blepharisma giesei Hirshfield, Isquith & Bhandary 1965