| Nominal Species (n = 86) | Present allocation (n = 84) | Ref. |
|---|---|---|
| Leptosomatum abyssale Chitwood, 1936 | Leptosomatum abyssale | 19 |
| Leptosomatum acephalatum Chitwood, 1936 | Leptosomatum acephalatum | 19 |
| Leptosomella acrocerca Filipjev, 1927 | Leptosomella acrocerca | 19 |
| Thoracostoma angustifissulatum Mawson, 1956 | Thoracostoma angustifissulatum | 19 |
| Thoracostoma anocellatum Schurmans-Stekhoven & Mawson, 1954 | Thoracostoma anocellatum | 3477 |
| Leptosomatum antarcticum Linstow, 1892 | Deontostoma antarcticum | 75097 |
| Leptosomatides antarcticus Mawson, 1956 | Leptosomatides antarcticus | 19 |
| Leptosomatina appendixocaudata Allgen, 1957 | Leptosomatina appendixocaudata | 19 |
| Leptosomatum arcticum Filipjev, 1916 | Leptosomatum arcticum | 19 |
| Thoracostoma arcticum Ssaweljev, 1912 | Deontostoma arcticum | 3477 |
| Parabarbonema barba Inglis, 1964 | Parabarbonema barba | 19 |
| Leptosomatum bathybium Allgen, 1954 | Leptosomatum bathybium | 19 |
| Leptosomatum breviceps Platonova, 1967 | Leptosomatum breviceps | 19 |
| Fiacra brevisetosus Southern, 1914 | Eusynonchus brevisetosus | 75097 |
| Paracylicolaimus brevisetosus Platonova, 1970 | Paracylicolaimus brevisetosus | 19 |
| Pseudocella bursata Platonova, 1962 | Pseudocella bursata | 19 |
| Deontostoma californicum Steiner & Albin, 1933 | Deontostoma californicum | 19 |
| Thoracostoma campbelli Ditlevsen, 1921 | Thoracostoma campbelli | 19 |
| Platycoma cephalata Cobb, 1894 | Platycoma cephalata | 19 |
| Thoracostoma coecum Ssaweljev, 1912 | Pseudocella coeca | 75097 |
| Thoracostoma comes Turk, 1903 | Paratuerkiana comes | 75097 |
| Leptosomatina conicaudata Vitiello, 1970 | Leptosomatina conicaudata | 19 |
| Thoracostoma crassidermum Allgen, 1947 | Thoracostoma crassidermum | 19 |
| Leptosomatides crassus Platonova, 1967 | Leptosomatides crassus | 19 |
| Platycomopsis curiosa Gerlach, 1955 | Platycoma curiosa | 75097 |
| Thoracostoma demani Mawson, 1956 | Deontostoma demani | 3477 |
| Synonchus dubius Wieser, 1954 | Synonchus dubius | 19 |
| Thoracostoma echinodon Marion, 1870 | Thoracostoma coronatum | 75097 |
| Cylicolaimus edentulus Platonova, 1970 | Cylicolaimus edentulus | 19 |
| Metacylicolaimus effilatus Stekhoven, 1946 | Metacylicolaimus effilatus | 19 |
| Leptosomatum elongatum Bastian, 1865 | Leptosomatum elongatum | 19 |
| Paraleptosomatides elongatus Mawson, 1956 | Paraleptosomatides elongatus | 19 |
| Leptosomatides euxinus Filipjev, 1918 | Leptosomatides euxinus | 19 |
| Synonchus fasciculatus Cobb, 1894 | Synonchus fasciculatus | 19 |
| Platycomopsis filiappendiculata Micoletzky, 1930 | Platycomopsis filiappendiculata | 19 |
| Thoracostoma filipjevi Kreis, 1928 | Corythostoma filipjevi | 75097 |
| Metacylicolaimus flagellicaudatus Stekhoven, 1946 | Metacylicolaimus flagellicaudatus | 19 |
| Barbonema flagrum Gerlach, 1957 | Barbonema flagrum | 19 |
| Thoracostoma galatheae Wieser, 1956 | Synonchoides galatheae | 75097 |
| Leptosomatum gracile Bastian, 1865 | Leptosomatum gracile | 19 |
| Pseudocella gracilis Platonova, 1967 | Pseudocella gracilis | 19 |
| Barbonema horridum Gerlach, 1956 | Barbonema horridum | 19 |
| Leptosomatum indicum Stewart, 1914 | Leptosomatum indicum | 19 |
| Leptosomatides inocellatus Platonova, 1967 | Leptosomatides inocellatus | 19 |
| Synonchus intermedius Allgen, 1939 | Synonchus intermedius | 19 |
| Thoracostoma jae Inglis, 1964 | Thoracostoma jae | 19 |
| Thoracostoma jollaense Allgen, 1947 | Thoracostoma jollaense | 19 |
| Leptosomatina longiseta Allgen, 1951 | Leptosomatina longiseta | 19 |
| Leptosomatum longisetosum Stekhoven, 1943 | Leptosomatum longisetosum | 19 |
| Ritenbenkia macropapillata Allgen, 1957 | Ritenbenkia macropapillata | 19 |
| Thoracostoma magnificum Timm, 1951 | Deontostoma magnificum | 75097 |
| Leptosomatum magnum Villot, 1875 | Cylicolaimus magnus | 75097 |
| Platycomopsis mesjatzevi Filipjev, 1927 | Platycomopsis mesjatzevi | 19 |
| Leptosomatum micoletzkyi Inglis, 1971 | Leptosomatum micoletzkyi | 19 |
| Leptosomatum microlaimum Allgen, 1957 | Leptosomatum microlaimum | 19 |
| Thoracostoma microlobatum Allgen, 1947 | Thoracostoma microlobatum | 19 |
| Pseudocella minor Platonova, 1962 | Pseudocella minor | 19 |
| Synonchus murmanicus Filipjev, 1927 | Synonchus murmanicus | 19 |
| Cylicolaimus obtusidens Ditlevsen, 1926 | Cylicolaimus obtusidens | 19 |
| Thoracostoma pacificum Murphy, 1965 | Deontostoma magnificum | 75097 |
| Thoracostoma panamaense Allgen, 1947 | Pseudocella panamaensis | 75097 |
| Thoracostoma papillosum Ditlevsen, 1921 | Thoracostoma papillosum | 19 |
| Platycomopsis paracobbi Mawson, 1956 | Platycomopsis paracobbi | 19 |
| Leptosomatum pedroense Allgen, 1947 | Leptosomatum pedroense | 19 |
| Thoracostoma penduli Allgen, 1954 | Thoracostoma penduli | 19 |
| Leptosomella phaustra Inglis, 1971 | Leptosomella phaustra | 19 |
| Thoracostoma philippinense Allgen, 1951 | Thoracostoma philippinense | 19 |
| Leptosomatum sabangense Steiner, 1915 | Leptosomatum sabangense | 19 |
| Thoracostoma schizoepistylium Butschli, 1874 | Thoracostoma schizoepistylium | 19 |
| Barbonema setiferum Filipjev, 1927 | Barbonema setiferum | 19 |
| Leptosomatum setosum Linstow, 1896 | Thoracostoma setosum | 75097 |
| Macronchus shealsi Inglis, 1964 | Macronchus shealsi | 19 |
| Nudolaimus simplex Allgen, 1929 | Cylicolaimus magnus | 75097 |
| Paraleptosomatides spiralis Mawson, 1956 | Paraleptosomatides spiralis | 19 |
| Thoracostoma steineri Micoletzky, 1922 | Thoracostoma steineri | 19 |
| Pseudocella tenuis Filipjev, 1946 | Pseudocella tenuis | 19 |
| Leptosomatum tetrophthalmum Ssaweljev, 1912 | Leptosomatum tetrophthalmum | 19 |
| Thoracostoma trachygaster Hope, 1967 | Thoracostoma trachygaster | 19 |
| Pseudocella triaulolaimus Hope, 1967 | Corythostoma triaulolaimus | 75097 |
| Hemipsilus trichodes Leuckart, 1849 | Pseudocella trichodes | 75097 |
| Syringonomus typicus Hope & Murphy, 1969 | Syringonomus typicus | 19 |
| Thoracostoma unifenestratum Allgen, 1959 | Thoracostoma unifenestratum | 19 |
| Thoracostoma vallini Allgen, 1928 | Thoracostoma vallini | 19 |
| Thoracostoma washingtonense Murphy, 1965 | Deontostoma washingtonense | 75097 |
| Pseudocella wieseri Hope, 1967 | Pseudocella wieseri | 19 |
| Thoracostoma zeae Inglis, 1964 | Thoracostoma zeae | 19 |