Species (15.149)
- Nassula longinassa Foissner 1979
- Nassula minima Minkiewicz 1899
- Nassula magna Smith 1897
- Nassula muscicola Kahl 1931
- Nassula ornata Ehrenberg 1833
- Nassula oblonga Maupas 1883
- Nassula protectissima Penard 1922
- Nassula ougandae Dragesco 1972
- Nassula pseudonassula Penard 1922
- Nassula picta Greeff 1888
- Nassula pusilla Kahl 1931
- Nassula renalis Ozaki & Yagiu 1941
- Nematacineta rotunda Allgen ()
- Nematopoda cylindrica Sand 1901
- Nemertodendron prenanti Dubosq 1925
- Monodontophrya kijenski Cheissin 1930
- Morgania mytili Andre 1910
- Muniziella cunhai Fonseca 1939
- Mycterothrix atra Gelei 1950
- Mycterothrix acuminata Gellert 1955
- Mycterothrix cardioides Gelei 1950
- Mycterothrix erlangeri Lauterborn 1898
- Mycterothrix lichenicola Gelei 1950
- Mycterothrix rottalensis Baumeister 1943
- Mycterothrix umbrellata Gelei 1950
- Mykophagophrys armata Kahl 1926
- Mykophagophrys terricola Foissner 1985
- Mylestoma anatinum Penard 1922
- Mylestoma spinigerum Kahl 1931
- Mylestoma flagellatum Penard 1922
- Mylestoma uncinatum Penard 1922
- Myoschiston duplicatum Precht 1935
- Myoscyphidia hyalina Jankowski 1985
- Myriokaryon lieberkühni Bütschli 1889
- Myriokaryon lieberkühnii Bütschli 1889
- Myrionecta rubra Lohmann 1908
- Mytilophilus pacificae Antipa & Dolan 1985
- Euplotes cristatus Kahl 1932
- Diophrys magnus Raikov & Kovaleva 1968
- Monintranstylum rotundus Banina 1977
- Monochilium blochmanni Lepsi 1926
- Monintranstylum ranae Stiller 1953
- Monochilium elongatum Mermod 1914
- Monochilium ovale Schewiakoff 1893
- Monochilium tesselatum Penard 1922
- Monodinium alveolatum Kahl 1930
- Monodinium balbianii Foissner, Berger & Schaumburg 1999 ssp. breviboscis
- Microdysteria decora Deroux 1976
- Microdiaphanosoma terricola Foissner 1993
- Monodinium balbianii Fabre-Domergue 1888 ssp. balbianii
- Monodinium balbianii Kahl 1926 ssp. rostratum
- Nannophrya truncata Kahl 1933
- Nyctotherus basidentitermes Gisler 1967
- Nyctotherus ampullarium Cordero 1928
- Nyctotherus beltrami Hegner 1940
- Nyctotherus beta Earl 1972
- Nyctotherus macrotermitis Gisler 1967
- Nyctotherus mandrakae Tuzet & Manier 1954
- Nyctotherus mardonii Tuzet, Manier & Vogeli-Zuber 1952
- Nyctotherus mauriesi Albaret 1970
- Nyctotherus multiporiferus Walker 1909
- Nyctotherus mutsorae Jeekel, Manier & Jolivet 1958
- Nyctotherus neocurtillae Carini 1938
- Nyctotherus nimbani Tuzet, Manier & Vogeli-Zuber 1952
- Nyctotherus obesus Tuzet & Théodoridés 1956
- Nyctotherus panesthiae Yamasaki 1939
- Nyctotherus paeninsulae Gisler 1967
- Nyctotherus piscicola Daday 1905
- Nyctotherus ovalis Leidy 1850
- Nyctotherus regalis Gisler 1967
- Nyctotherus rhamphidarpae Jeekel, Tuzet, Manier & Vogeli-Zuber 1952
- Nyctotherus rhinocrici Mello 1953
- Nyctotherus salihi Salih & Hammodi 1995
- Nyctotherus rosenbergi Rosenberg 1937
- Nyctotherus scinci Puytorac 1954
- Nyctotherus silvestrianus Kirby 1932
- Nyctotherus sokoloffi Schouten 1940
- Nyctotherus teleacus Geiman & Wichtermann 1937
- Nyctotherus termitis Dobell 1910
- Nyctotherus thyropygus Karandikar & Rodgi 1956
- Nyctotherus trachysauri Johnson 1932
- Nyctotherus woodi Amrein 1952
- Nyctotherus travassosi Cunha & Penido 1927
- Obertrumia aurea Ehrenberg 1833
- Obertrumia georgiana Dragesco 1972
- Obertrumia gracilis Foissner 1989
- Obertrumia kahli Foissner 1989
- Obertrumia tumida Maskell 1887
- Ochoterenaia appendiculata Chavarria 1933
- Ochridanus kozarovi Puytorac 1959
- Odontochlamys alpestris Foissner 1981
- Odontochlamys gouraudi Certes 1891
- Odontochlamys convexa Kahl 1931
- Odontochlamys wisconsinesis Kahl 1931
- Odontophorella serrulata Kofoid & Campbell 1929
- Oenophorachona sagitta Jankowski 1973
- Oenophorachona ectenolaemus Matsudo & Mohr 1968
- Oenophorachona urceolata Jankowski 1973
- Oligoisotricha bubali Dogiel 1928
- Ophryodendron faurei Guilcher 1950