Species (15.149)
- Spirochona brevis Jankowski 1973
- Spirochona elegans Swarczewsky 1928
- Spirochona elegantula Swarczewsky 1928
- Spirochona globulus Swarczewsky 1928
- Spirochona gemmipara Stein 185?
- Spirochona marina Jankowski 1973
- Spirochona gnathopodialis Jankowski 1973
- Spirochona patella Swarczewsky 1928
- Spirochona nebalina Kent 1881
- Spirochona halophila Matsudo & Mohr 1968
- Spirochona pusilla Swarczewsky 1928
- Spirochona scheuteni Stein 1854
- Spirochona scheutenii Kent, sensu 1881
- Spirochona simplex Swarczewsky 1928
- Spirostomum loxodes Stokes 1885
- Spirostomum minus Roux 1901
- Spirostomum lanceolatum Gruber 1884
- Spirostomum semivirescens Perty 1852
- Spirostomum salinarum Florentin 1899
- Spirostrombidium coronatum Sauerbrey 1928
- Spirostomum virens Ehrenberg 1833
- Spirostrombidium cinctum Kahl 1932
- Spirostomum teres Claparède & Lachmann 1858
- Spirostrombidium elatum Alekperov 1985
- Spirostrombidium oblongum Entz 1884
- Spirostrombidium pseudocinctum Wang 1934
- Spirostrombidium sauerbreyae Kahl 1932
- Spirostrombidium rhyticollare Corliss & Snyder 1986
- Spirostrombidium siculum Montagnes & Taylor 1994
- Spirotricha paradoxa Sterki 1897
- Spirozona caudata Kahl 1926
- Splitofolliculina longicollis Hadzi 1951
- Splitofolliculina adherens Hadzi 1951
- Spoleoscyphidia husmanni Lüpkes ()
- Spongiophrya multitentaculata Sand ()
- Squalorophrya macrostyla Goodrich & Jahn 1943
- Spongiarcon variabilis Gruber ()
- Steinia inquieta Stokes 1887
- Steinia granulata Kahl 1932
- Steinia marina Kahl 1932
- Steinia muscorum Kahl 1932
- Steinia primicirrata Berger & Foissner 1987
- Steinia platystoma Ehrenberg 1831
- Steinia sphagnicola Foissner 1989
- Stelidiellia fenestrata Kofoid & Campbell 1939
- Stemacineta patula Claparède & Lachmann 1859
- Stenosemella expansa Wailes 1925
- Stenosemella avellana Meunier 1919
- Stenosemella lacustris Foissner & O'Donoghue 1990
- Stenosemella olivia Meunier 1910
- Stenosemella pacifica Kofoid & Campbell 1929
- Stenosemella perupusila Hada 1970
- Stenosemella producta Meunier 1919
- Stenosemella parvicollis Marshall 1934
- Stenosemella steini Jörgensen 1894
- Stenosemellopsis hispanica Colom 1939
- Stenotricha arenicolus Dragesco 1954
- Stenosemella punctata Wailes 1925
- Stenosemella ventricosa Claparède & Lachmann 1858
- Stappersia fusus Meunier 1907
- Stammeridium kahli Wenzel 1953
- Staurophrya elegans Zacharias 1893
- Steenstrupiella gracilis Jörgensen 1924
- Steenstrupiella intumescens Jörgensen 1924
- Steenstrupiella entzi Kofoid & Campbell 1929
- Steenstrupiella robusta Kofoid & Campbell 1929
- Steenstrupiella steenstrupii Claparède & Lachmann 1858
- Stegochilum fusiformis Schewiakoff 1892
- Stegochilum acutum Bürger 1908
- Stegochilum ovale Ghosh 1921
- Stegochilum fusiforme Schewiakoff 1893
- Stegochilum schoenborni Foissner 1985
- Stegochilum smalli Alekperov 1993
- Steinella uncinata Cépède 1910
- Steinia candens Kahl 1932
- Steinia balladynula Kahl 1932
- Steinia citrina Berger & Foissner 1987
- Steinia ferruginea Stein 1859
- Steinia gracilis Kahl 1932
- Steinia quadrinucleata Dragesco & Njiné 1971
- Steinia sapropelica Kahl 1932
- Steinia tetracirrata Gellert 1942
- Stelidiella phialia Kofoid & Campbell 1929
- Stelidiella simplex Kofoid & Campbell 1929
- Stelidiella fenestrata Kofoid & Campbell 1929
- Stenosemella inflata Kofoid & Campbell 1929
- Stenosemella nucula Fol 1884
- Stenosemella nivalis Meunier 1884
- Spathidium curvatum Kahl 1928
- Spathidium deforme Kahl 1928
- Spathidium elegans Kahl 1926
- Spathidium elongatum Penard 1922
- Spathidium falciforme Penard 1922
- Spathidium extensum Kahl 1933
- Spathidium faurei Kahl 1930
- Spathidium fontinale Penard 1922
- Spathidium fresenburgi Kahl 1928
- Spathidium furcatum Shibuya 1930
- Spathidium fossicolum Kahl 1933
- Spathidium geobium Lepsi 1951