| Diplosiphon livanovi Timoshkin, 1986 |  | 2-3 m |  |  | 
| Diplosiphon tetrastylus Timoshkin, 1986 | 1982-1984 | 2-3 m |  |  | 
| Diplosiphon baekmanae Timoshkin, 1986 | Feb 15, 1982 | 2-3 m |  |  | 
| Diplosiphon macrorhynchus Timoshkin, 1986 | Sep 9, 1984 | 80 m |  |  | 
| Diplosiphon macrorhynchus Timoshkin, 1986 | Sep 10, 1984 | 100 m |  |  | 
| Diplosiphon baekmanae Timoshkin, 1986 | Jul 14, 1982 | 2 m |  |  | 
| Diplosiphon ninae Timoshkin, 1986 | Sep 10, 1984 | 25 m |  |  | 
| Diplosiphon microstylus Timoshkin, 1986 | Sep 10, 1984 | 25 m |  |  | 
| Diplosiphon baikalensis (Rubtsov, 1929) | Jul 19, 1982 | 25 m |  |  | 
| Diplosiphon baikalensis (Rubtsov, 1929) | Sep 17, 1984 | 12-14 m |  |  | 
| Baicalarctia gula Friedmann, 1926 | 1926 or earlier |  |  |  | 
| Mesostoma ehrenbergii (Focke, 1836) | 1926 or earlier |  |  |  | 
| Prorhynchus baikalensis Timoshkin, 1991 | 1982-1997 | 2-430 m |  | The worms appear to be distributed all around the lake, including the abyssal zone of Northern Baikal.  Generally soft sediments. | 
| Geocentrophora incognita Timoshkin & Zabrovskaya, 1984 | 1999 or earlier |  |  |  | 
| Geocentrophora porfirievae Timoshkin & Zabrovskaya, 1984 | 1999 or earlier |  |  |  | 
| Geocentrophora intersticialis Timoshkin, 1984 | 1999 or earlier |  |  |  | 
| Geocentrophora levanidorum Timoshkin, 1984 | 1999 or earlier |  |  |  | 
| Geocentrophora wagini Timoshkin, 1984 | 1999 or earlier |  |  |  | 
| Baicalellia baicali Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia baicali bicornis Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia albicauda Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia nigrofasciata Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia pellucida Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia maculata Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia maculata nigra Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia maculata coerulea Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia ocellata Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Baicalellia posieti Nasonov, 1930 | 1930 or earlier |  |  |  | 
| Planaria nigrofasciata Grube, 1872 | 1917 |  |  |  | 
| Rimacephalus bistriatus Korotneff, 1901 | 1901 or earlier |  |  |  | 
| Polycelis linkoi Sabussov, 1901 | 1902 or earlier |  |  |  | 
| Planaria onegensis Sabussow, 1903 | 1902 or earlier |  |  |  | 
| Sorocelis leucocephala Sabussow, 1903 | 1903 or earlier |  |  |  | 
| Sorocelis fungiformis Sabussow, 1903 | 1903 or earlier |  |  |  | 
| Protocotylus fungiformis (Sabussow, 1903) | 1903 or earlier |  |  |  | 
| Sorocelis lineata Sabussow, 1903 | 1903 or earlier |  |  |  | 
| Sorocelis guttata (Gerstfeldt, 1858) | 1903 or earlier |  |  |  | 
| Sorocelis hepatizon (Grube, 1872) | 1903 or earlier |  |  |  | 
| Sorocelis tigrina (Grube, 1872) | 1903 or earlier |  |  |  | 
| Rimacephalus punctatus Sabussow, 1903 | 1903 or earlier |  |  |  | 
| Procotyla baicalensis Zabusov, 1903 | 1903 or earlier |  |  |  | 
| Planaria armata Kelaart, 1858 | 1903 or earlier |  |  |  | 
| Phagocata sibirica (Sabussow, 1903) | 1903 or earlier |  |  |  | 
| Fonticola sibirica (Sabussow, 1903) | 1903 or earlier |  |  |  | 
| Planaria dybowskyi Sabussow, 1903 | 1903 or earlier |  |  |  | 
| Planaria angarensis Gerstfeldt, 1858 | 1903 or earlier |  |  |  | 
| Protocotylus flavus Korotneff, 1908 | 1908 or earlier |  |  |  | 
| Polycotylus profundus Korotneff, 1912 | 1900-1902 |  |  |  | 
| Polycotylus validus Korotneff, 1912 | 1900-1902 |  |  |  | 
| Tetracotylus tenax Korotneff, 1912 | 1900-1902 |  |  |  | 
| Graffiella lamelli-rostris Korotneff, 1912 | 1900-1902 |  |  |  | 
| Bdellocephala angarensis olivacea (Korotneff, 1912) | 1900-1902 |  |  |  | 
| Podoplana olivacea Korotneff, 1912 | 1900-1902 |  |  |  | 
| Sorocelis raddei Sabussow, 1911 | 1911 or earlier |  |  |  | 
| Sorocelis nigrofasciata (Grube, 1872) | 1911 or earlier |  |  |  | 
| Sorocelis pardalina (Grube, 1872) | 1911 or earlier |  |  |  | 
| Sorocelis leucocephala bifasciata Sabussow, 1911 | 1911 or earlier |  |  |  | 
| Sorocelis garjajewi Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis ussowii Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis bipartita Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis alba Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis rosea Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis tenuis Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis plana Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis linearis Sabussow, 1911 | 1911 or earlier |  |  |  | 
| Sorocelis koslowi Zabusov, 1911 | 1911 or earlier |  |  |  | 
| Sorocelis tibetica Zabusov, 1911 | 1911 or earlier |  |  |  | 
| Sorocelis fusca Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Sorocelis grisea Sabussow, 1903 | 1911 or earlier |  |  |  | 
| Diplosiphon baikalensis (Rubtsov, 1929) | 1929 or earlier | 80 m |  |  | 
| Opisthocystis curvistylus Timoshkin, 1986 | Jul 12, 1984 |  |  |  | 
| Opisthocystis pedistylus Timoshkin, 1986 | Jul 19, 1985 |  |  |  | 
| Opisthocystis abyssalis Timoshkin, 1986 | Jun 16, 1983 | 690-720 m |  |  | 
| Opisthocystis sabussovi Timoshkin, 1986 | Jul 10, 1983 |  |  |  | 
| Opisthocystis cariottus Timoshkin, 1986 | Sep 11, 1984 | 100 m |  |  | 
| Geocentrophora intersticialis Timoshkin, 1984 | Jul 1982 |  |  |  | 
| Geocentrophora porfirievae Timoshkin & Zabrovskaya, 1984 | Jun 1982 |  |  |  | 
| Geocentrophora wagini Timoshkin, 1984 | Jul 1982 | 5 m |  |  | 
| Geocentrophora levanidorum Timoshkin, 1984 | Jul 1982 | 6-7 m |  |  | 
| Geocentrophora gigas Timoshkin, 1984 | Jul 1982 | 10 m |  |  | 
| Geocentrophora incognita Timoshkin & Zabrovskaya, 1984 | Apr 13, 1982 | 7 m |  |  | 
| Archicotylus decoloratus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus cinereus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus elongatus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus maculatus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus rutilus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus flavus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Archicotylus lacteus Korotneff, 1912 | 1912 or earlier |  |  |  | 
| Microarchicotylus stringulatus (Korotneff, 1912) | 1912 or earlier |  |  |  | 
| Archicotylus junca (Korotneff, 1912) | 1912 or earlier |  |  |  | 
| Archicotylus rubzowi Porfirieva, 1977 | 1912 or earlier | 3-20 m |  |  | 
| Archicotylus parvipunctatus (Korotneff, 1912) | 1912 or earlier |  |  |  | 
| Archicotylus parvipunctatus (Korotneff, 1912) | 1912 or earlier | 2-20 m |  |  | 
| Archicotylus planus (Sabussow, 1903) | 1903 or earlier |  |  |  | 
| Archicotylus planus (Sabussow, 1903) | 1977 or earlier | 4-70 m |  |  | 
| Armilla livanovi Kenk, 1974 | 1903 or earlier | 35-42 m |  |  | 
| Armilla pardalina (Grube, 1872) | 1872 or earlier | 10 - 150 m |  |  | 
| Papilloplana leucocephala (Sabussow, 1903) | 1903 or earlier | 2 - 25 m |  |  | 
| Papilloplana grisea (Sabussow, 1903) | 1903 or earlier | 6-40 m |  |  | 
| Papilloplana zebra Grube, 1872 | 1872 or earlier | 1.8-21 m |  |  | 
| Hyperbulbina bifasciata (Sabussow, 1903) | 1903 or earlier | 1.5-50 m |  |  | 
| Hyperbulbina grubei (Sabussow, 1903) | 1903 or earlier | 2-5, 300 m |  |  | 
| Hyperbulbina bekmanae Porfirieva, 1977 | 1970 | 400-600  m |  |  | 
| Hyperbulbina nana Porfirieva, 1977 | 1967 | 60 m |  |  | 
| Alaoplana sublanceolata (Livanov & Porfirjeva, 1964) | 1977 or earlier | 1-400 m |  |  | 
| Alaoplana lanceolata (Grube, 1872) | 1872 or earlier | 5-65 m |  |  | 
| Hyperpapillina graffi (Sabussow, 1903) | 1903 or earlier | 15-236 m |  |  | 
| Hyperpapillina ocellata (Korotneff, 1912) | 1912 or earlier | 1-110 m |  |  | 
| Bdellocephala angarensis (Gerstfeldt, 1858) | 1858 or earlier | 1.5-2 m |  |  | 
| Bdellocephala angarensis angarensis (Gerstfeldt, 1858) | 1858 or earlier | 1.5-2 m |  |  | 
| Bdellocephala baicalensis (Zabusova, 1903) | 1903 or earlier | 1-70 m |  |  | 
| Rimacephalus pulvinar (Grube, 1872) | 1872 or earlier | 8-100 m |  |  | 
| Rimacephalus arecepta Porfirieva, 1969 | 1969 or earlier | 50-286 m |  |  | 
| Baikalocotylus limnosus Porfirieva, 1977 | Aug 25, 1968 | 30 m |  | Maloe More. | 
| Baikalocotylus limnosus Porfirieva, 1977 | Aug 29, 1967 | 3 m |  |  | 
| Atria kozhowi Porfirieva, 1970 | 1970 or earlier | 54-230 m |  |  | 
| Sorocelis nigrofasciata (Grube, 1872) | 1872 or earlier | 1-200 m |  |  | 
| Sorocelis hepatizon (Grube, 1872) | 1872 or earlier | 1-525m |  |  | 
| Protocotylus flavus Korotneff, 1908 | 1977 and earlier | 6-1125 m |  |  | 
| Baikalobia guttata (Gerstfeldt, 1858) | 1858 or earlier | 0-70 m |  |  | 
| Baikalobia variegata (Korotneff, 1912) | 1912 or earlier | 1.5-20 m |  |  | 
| Baikalobia copulatrix (Korotneff, 1912) | 1912 or earlier | 1-25 m |  |  | 
| Baikalobia raddei (Sabussowa, 1911) | 1911 or earlier |  |  |  | 
| Strongylostoma radiatum (Müller, 1774) | 1935 or earlier |  |  | Bucht des Bailkalsees, nicht im See selbst. | 
| Mesostoma ehrenbergii (Focke, 1836) | 1926 or earlier |  |  | Umgebung des Baikal-Sees, Tümpel auf gefrorenem Boden, nicht im See. | 
| Baikalotomesostoma stomi Timoshkin, Lukhnev, & Zaytseva 2010 | 2010 or earlier |  |  |  | 
| Otomesostoma arovi Timoshkin, Lukhnev, & Zaytseva, 2010 | 2010 or earlier |  |  |  | 
| Opisthocystis aleksandri Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis igori Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis kornilorum Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis marinae Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis meyeri Timoshkin, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis novitzkyi Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis stepashi Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Opisthocystis sturmbaueri Timoshkin, Zaytseva & Gutsol, 2009 | 2009 or earlier |  |  |  | 
| Microarchicotylus elegans (Porfiriev, Timoshkin & Zaytseva, 2009) | 2009 or earlier |  |  |  | 
| Armilla armata (Sabussow, 1903) | 1961 or earlier |  |  |  | 
| Baikalobia copulatrix (Korotneff, 1912) | 1961 or earlier |  |  |  | 
| Baikalobia guttata major Livanov, 1961 | 1961 or earlier |  |  |  | 
| Baikalobia raddei (Sabussowa, 1911) | 1961 or earlier |  |  |  | 
| Bdellocephala hypervesiculina Livanov, 1962 | 1961 or earlier |  |  |  | 
| Protocotylus flavus Korotneff, 1908 | 1961 or earlier |  |  |  | 
| Rimacephalus pulvinar (Grube, 1872) | 1961 or earlier |  |  |  | 
| Sorocelis hepatizon (Grube, 1872) | 1961 or earlier |  |  |  | 
| Microdalyellia armigera (Schmidt, 1862) | 1926 or earlier |  |  | Ufer des Baikal, Tümpel auf gefrorenem Boden, aber an der Oberfläche + 18.5º C. | 
| Microdalyellia fusca (Fuhrmann, 1894) | 1926 or earlier |  |  | Tümpel am Ufer des Baikal, auf gefrorenem Boden | 
| Microarchicotylus ochroleucus Porfiriev & Timoshkin, 2015 | 2015 or earlier |  |  |  | 
| Otomesostoma auditivum (Forel & du Plessis, 1874) | 2015 or earlier |  |  |  | 
| Baikalobia elochinensis Porfiriev & Timoshkin, 2018 | 2018 or earlier |  |  |  | 
| Riedelella lukhnevi Timoshkin & Krivorotkin, 2023 | 2023 or earlier | 1.5 to 3.8 M | "on sandy or rocky bottoms" | "found when studying the benthic communities at the western coast of the southern basin of Lake Baikal, Siberia" | 
| Mariareuterella misharinae Timoshkin & Krivorotkin, 2023 | 2023 or earlier | 1.5 to 3.8 M | "on sandy or rocky bottoms" | "found when studying the benthic communities at the western coast of the southern basin of Lake Baikal, Siberia" | 
| Coulterella takhteevi Timoshkin & Krivorotkin, 2023 | 2023 or earlier | 1.5 to 3.8 M | "on sandy or rocky bottoms" | "found when studying the benthic communities at the western coast of the southern basin of Lake Baikal, Siberia" | 
| Cohenella angelinae Timoshkin & Krivorotkin, 2023 | 2023 or earlier | 1.5 to 3.8 M | "on sandy or rocky bottoms" | "found when studying the benthic communities at the western coast of the southern basin of Lake Baikal, Siberia" | 
| Cohenella kostockii Timoshkin, 2022 | 2023 or earlier | 1.5 to 3.8 M | "on sandy or rocky bottoms" | "found when studying the benthic communities at the western coast of the southern basin of Lake Baikal, Siberia" |