Species (15.149)
- Loxophyllum vitraeum Dragesco 1965
- Lubetiella micheli Puytorac 1959
- Loxophyllum vorax Stokes 1886
- Lubetiella proditrix Puytorac 1959
- Ludio parvulus Penard 1922
- Luxiella mitra Lecal 1953
- Lwoffia cilifera Kozloff 1955
- Lynchella cypris Jankowski 1968
- Lynchella aspidisciformis Kahl 1933
- Lynchella dirempta Deroux 1970
- Lynchella fencheli Jankowski 1968
- Lynchella gradata Kahl 1933
- Lynchella nordica Jankowski 1968
- Lynchella tentaculata Deroux 1970
- Magnalembus oceanicus Small & Lynn 1985
- Magnifolliculina binalata
- Malacophrys viridis Foissner 1980
- Mantoscyphidia littorinae Issel ()
- Marinecta pelagica Daday 1888
- Marituja pelagica Gajewskaja 1928
- Marshallia aperta Marshall 1934
- Mastigostephanus sulcatus Levander 1894
- Megadinium aethiopicum Latteur & Dufey 1967
- Megatricha integra Perty 1852
- Megatricha partita Perty 1852
- Membranicola tamari Foissner, Berger & Schaumburg 1999
- Mesanophrys carcini Groliere & Léglise 1977
- Meserellus multiformis Müller ()
- Mesanophrys maggii Cattaneo 1888
- Meseres cordiformes Schewiakoff 1893
- Meseres corlissi Petz & Foissner 1992
- Meseres stentor Schewiakoff 1893
- Mesniella beani Cheissin 1930
- Mesniella aculeata Georgevitch 1941
- Mesniella bohemica Lom 1959
- Mesniella bispiculata Rossolimo 1926
- Mesniella hynnis Georgevitch 1941
- Mesniella kochi Heidenreich 1935
- Mesniella paranaidos Pierantoni 1909
- Mesniella spiculata Warpachowsky 1886
- Mesniella rostrata Rossolimo 1926
- Mesniella trispiculata Kijenskij 1925
- Mesniella stammeri Heidenreich 1935
- Mesnilella clavata Leidy 1855
- Mesodinium acarus Stein 1867
- Mesodinium cinctum Calkins 1902
- Mesodinium apsheronicum Alekperov & Asadullayeva 1996
- Mesodinium sp. Stein 1863
- Metacineta mystacina Batisse 1967 ssp. pachystyla
- Metacineta stagnalis Stokes 1886
- Metaclevelandella termitis Uttangi & Desai 1963
- Metacineta mystacina Ehrenberg 1831 ssp. carchesii
- Metacyclina morace Radoicic 1965
- Metacylis annulifera Ostenfeld & Schmidt 1901
- Metacylis annulata Meunier 1910
- Metacylis conica Kofoid & Campbell 1929
- Metacylis corbula Kofoid & Campbell 1929
- Metacylis daphnicola Penard 1922
- Metacylis crassa Gourret & Roeser 1886
- Metacylis elongata Kahl 1928
- Metacylis jörgensenii Cleve 1902
- Metacylis exigua Penard 1922
- Metacylis lagenula Penard 1922
- Metacylis lucasensis Kofoid & Campbell 1929
- Metacylis mereschkowskii Kofoid & Campbell 1929
- Metacylis megaptere Kahl 1930
- Metacylis recurva Penard 1922
- Metacylis rossica Kofoid & Campbell 1929
- Metacylis truncata Cohn 1866
- Metacylis tesselata Kahl 1926
- Metacylis striata Stokes 1893
- Metacylis vitreoides Kofoid & Campbell 1929
- Metacystis agigeana Tucolesco 1962
- Metacystis annulata Stokes 1895
- Metacystis crassa Gourret & Roeser 1886
- Metacystis elongata Kahl 1928
- Metacystis hyperhalina Dietz 1964
- Metacystis nana Tucolesco 1962
- Metacystis recurva Penard 1922
- Metacystis tekirghiolica Tucolesco 1962
- Metacystis striata Stokes 1893
- Metacystis tesselata Kahl 1926
- Metacystis truncata Cohn 1866
- Metadinium affine -> LB0002: 62
- Metadinium banksi -> LB0002: 62
- Metadinium caudatum -> LB0002: 62
- Metadinium medium Awerinzew & Mutafowa 1914
- Metadinium esalqum -> LB0002: 62
- Metadinium magnum -> LB0002: 62
- Metadinium rotundatum -> LB0002: 62
- Metadinium sablei -> LB0002: 62
- Metadinium tauricum -> LB0002: 62
- Metadinium minorum -> LB0002: 62
- Metadinium ypsilon -> LB0002: 62
- Metafolliculina elongata Das 1949
- Metafolliculina andrewsi Hadzi 1938
- Metafolliculina longicollis Hadzi 1938
- Metafolliculina nordgardi Dons 1927
- Metafolliculina producta Wright 1859
- Metanyctotherus congoi Tuzet ea 1957