Acrorhynchides robustus (Karling, 1931) Strand, 1928 (additional source)
Alexlutheria psammophila Ax, 2008 (original description)
Anthopharynx sacculipenis Ehlers, 1972 (additional source)
Archilina japonica Ax, 2008 (original description)
Archiloa westbladi Ax, 1954 accepted as Archiloa rivularis de Beauchamp, 1910 (source of synonymy)
Axiutelga aculeata (Ax, 1959) Karling, 1980 (additional source)
Baicalellia anchoragensis Ax & Armonies, 1990 (additional source)
Baicalellia brevituba accepted as Baicalellia brevitubus (Luther, 1918) Nasonov, 1930 (additional source)
Baicalellia canadensis Ax & Armonies, 1987 (additional source)
Baicalellia rectis Ax, 2008 (original description)
Balgetia semicirculifera Karling, 1962 (additional source)
Baltoplana magna Karling, 1949 (additional source)
Baltoplana valkanovi Ax, 1959 (additional source)
Beauchampiola canadiana Ax, 2008 (original description)
Beauchampiola mackfirae Ax, 2008 (original description)
Beklemischeviella angustior Luther, 1943 (additional source)
Beklemischeviella brevistyla Beklemischev, 1953 (status source)
Beklemischeviella contorta (Beklemischev, 1927) Luther, 1943 (additional source)
Brederveldia van der Velde & van de Winkel, 1975 (additional source)
Brederveldia bidentata Van Der Velde & Van De Winkel, 1975 (additional source)
Bresslauilla relicta Reisinger, 1929 (additional source)
Brinkmanniella macrostomoides Luther, 1948 (additional source)
Brunetia camarguensis (Brunet, 1965) Karling, 1980 (additional source)
Byrsophlebs dubia (Ax, 1956) Karling, 1985 (additional source)
Byrsophlebs simplex (Ax, 1959) Karling, 1985 (additional source)
Canetellia nana Ax, 2008 accepted as Baicalellia nana (Ax, 2008) Stephenson, Van Steenkiste & Leander, 2019 (original description)
Carcharodorhynchus subterraneus Meixner, 1938 (additional source)
Ceratopera falcata (Ax, 1953) Van Steenkiste & Leander, 2018 (additional source)
Ceratopera falcata falcata (Ax, 1953) Van Steenkiste & Leander, 2018 (additional source)
Ceratopera falcata valida (Ax, 1977) Van Steenkiste & Leander, 2018 (additional source)
Cheliplana deverticula Ax, 2008 (additional source)
Cheliplana deverticula Ax, 2008 (original description)
Cheliplana euxeinos Ax, 1959 (additional source)
Cheliplana setosa Evdonin, 1971 (additional source)
Cheliplana stylifera Karling, 1949 (additional source)
Cheliplana vestibularis de Beauchamp, 1927 (additional source)
Chlamydorhynchus evekuniensis Evdonin, 1977 (additional source)
Cicerina brevicirrus Meixner, 1928 (additional source)
Cicerina eucentrota Ax, 1959 (additional source)
Cicerina tetradactyla Giard, 1904 (additional source)
Clyporhynchus monolentis Karling, 1947 (additional source)
Coelogynopora bresslaui Steinböck, 1924 accepted as Coelogynopora sequana Sopott-Ehlers, 1992 (source of synonymy)
Coelogynopora coronata Ax, 2008 (original description)
Coelogynopora faeroernensis Ax, 2008 (original description)
Coronhelmis conspicuus Ax, 1994 (additional source)
Coronhelmis exiguus Ax, 1994 (additional source)
Coronhelmis inornatus Ehlers, 1974 (additional source)
Coronhelmis multispinosus Luther, 1948 (additional source)
Coronhelmis noerrevangi Ax, 1994 (additional source)
Coronhelmis subtilis Ax, 2008 (original description)
Coronhelmis tripartitus Ehlers, 1974 (additional source)
Coronhelmis urna Ax, 1954 (additional source)
Coronopharynx pusillus Luther, 1962 accepted as Baicalellia pusilla (Luther, 1962) Stephenson, Van Steenkiste & Leander, 2019 (additional source)
Cystiplana paradoxa Karling, 1964 (additional source)
Diascorhynchus caligatus Ax, 1959 (additional source)
Diascorhynchus lappvikensis Karling, 1963 (additional source)
Diascorhynchus serpens Karling, 1949 (additional source)
Djeziraia euxinica (Mack-Fira, 1971) Schockaert, 1982 (additional source)
Duplacrorhynchus major Schockaert & Karling, 1970 (additional source)
Duplominona filiformis Ax, 2008 (original description)
Duplominona japonica Ax, 2008 (original description)
Eldenia Ax, 2008 (original description)
Eldenia reducta Ax, 2008 (original description)
Gieysztoria expedita expeditoides Luther, 1955 accepted as Gieysztoria expeditoides Luther, 1955 (status source)
Gieysztoria expeditoides Luther, 1955 (status source)
Gieysztoria maritima Luther, 1955 (status source)
Gnathorhynchus conocaudatus Meixner, 1929 (additional source)
Gnathorhynchus krogeni Karling, 1947 (status source)
Gyratrix hermaphroditus Ehrenberg, 1831 (additional source)
Halammovortex promacropharynx Ax, 2008 (original description)
Halammovortex pseudonigrifrons Ax, 2008 (original description)
Halammovortex supranigrifrons Ax, 2008 (original description)
Haloplanella carolinensis Ax, 2008 (original description)
Haloplanella obtusituba Luther, 1946 (additional source)
Haplovejdovskya subterranea Ax, 1954 (additional source)
Hartogia pontica Mack-Fira, 1968 (additional source)
Itaipusa karlingi Mack-Fira, 1968 (additional source)
Itaipusa scotica (Karling, 1954) Karling, 1978 accepted as Reinhardorhynchus scoticus (Karling, 1954) Diez, Monnens & Artois, 2021 (additional source)
Kirgisella forcipata Beklemischev, 1927 accepted as Neokirgella forcipata (Beklemischev, 1927) (original description)
Lutheriella diplostyla Hartog, 1966 (additional source)
Macrostomum acutum Ax, 2008 (original description)
Macrostomum bellebaruchae Ax, 2008 (original description)
Macrostomum calcaris Ax, 2008 (original description)
Macrostomum clavituba Ax, 2008 (original description)
Macrostomum flexum Ax, 2008 (original description)
Macrostomum gallicum Ax, 2008 (original description)
Macrostomum guttulatum Ax, 2008 (original description)
Macrostomum incurvatum Ax, 2008 (original description)
Macrostomum parthenopeum Beklemischev, 1951 accepted as Macrostomum rubrocinctum Ax, 1951 (source of synonymy)
Macrostomum rectum Ax, 2008 (original description)
Macrostomum semicirculatum Ax, 2008 (original description)
Macrostomum uncinatum Ax, 2008 (original description)
Maehrenthalia americana Ax & Armonies, 1990 (additional source)
Messoplana falcata (Ax, 1953) Den Hartog, 1966 accepted as Ceratopera falcata (Ax, 1953) Van Steenkiste & Leander, 2018 (additional source)
Messoplana falcata falcata (Ax, 1953) Den Hartog, 1966 accepted as Ceratopera falcata falcata (Ax, 1953) Van Steenkiste & Leander, 2018 (additional source)
Messoplana falcata valida Ax, 1977 accepted as Ceratopera falcata valida (Ax, 1977) Van Steenkiste & Leander, 2018 (additional source)
Minona minuta Ax, 2008 (original description)
Monocelopsis carolinensis Ax, 2008 (original description)
Neognathorhynchus lobatus (Ax, 1952) Karling, 1956 (additional source)
Odontorhynchus lonchiferus Karling, 1947 (additional source)

Alaska for Halammovortex promacropharynx Ax, 2008 
Alaska for Halammovortex promacropharynx Ax, 2008 
Baltic sea for Baicalellia brevituba 
Black Sea for Beauchampiola mackfirae Ax, 2008 
Canada for Beauchampiola canadiana Ax, 2008 
Canada for Halammovortex pseudonigrifrons Ax, 2008 
Canada for Placorhynchus separatus Ax, 2008 
Denmark for Canetellia nana Ax, 2008 
Denmark for Canetellia nana Ax, 2008 
Dutch Exclusive Economic Zone for Promesostoma rostratum Ax, 1951 
Faroe Islands for Archilopsis unipunctata (Fabricius, 1826) 
Faroe Islands for Archilopsis unipunctata (Fabricius, 1826) 
Faroe Islands for Archilopsis unipunctata (Fabricius, 1826) 
Faroe Islands for Beklemischeviella contorta (Beklemischev, 1927) Luther, 1943 
Faroe Islands for Coelogynopora biarmata Steinböck, 1924 
Faroe Islands for Coelogynopora coronata Ax, 2008 
Faroe Islands for Coelogynopora faeroernensis Ax, 2008 
Faroe Islands for Coelogynopora faeroernensis Ax, 2008 
Faroe Islands for Coelogynopora faeroernensis Ax, 2008 
Faroe Islands for Coelogynopora gynocotyla Steinböck, 1924 
Faroe Islands for Coronhelmis lutheri Ax, 1951 
Faroe Islands for Itaspiella helgolandica (Meixner, 1938) 
Faroe Islands for Itaspiella helgolandica (Meixner, 1938) 
Faroe Islands for Macrostomum balticum Luther, 1947 
Faroe Islands for Macrostomum distinguendum Papi, 1951 
Faroe Islands for Placorhynchus echinulatus Karling, 1947 
Faroe Islands for Provortex impeditus Ax, 2008 
Faroe Islands for Provortex impeditus Ax, 2008 
Faroe Islands for Provortex impeditus Ax, 2008 
Faroe Islands for Provortex karlingi Ax, 1951 
Faroe Islands for Provortex karlingi Ax, 1951 
Faroe Islands for Provortex karlingi Ax, 1951 
Faroe Islands for Provortex pallidus Luther, 1948 
Faroe Islands for Provortex pallidus Luther, 1948 
Faroe Islands for Stygoplanellina saksunensis Ax, 2008 
Finland for Beklemischeviella angustior Luther, 1943 
Finland for Beklemischeviella angustior Luther, 1943 
Finland for Ptychopera spinifera Den Hartog, 1966 
Finnish Exclusive Economic Zone for Balgetia hyalina Karling, 1962 
Finnish Exclusive Economic Zone for Macrostomum rectum Ax, 2008 
Finnish Exclusive Economic Zone for Provortex balticus (Schultze, 1851) Graff, 1882 
France for Allostoma catinosum (Beklemischev, 1927) Mack Fira, 1974 
France for Archiloa petiti Ax, 1956 
France for Axiutelga aculeata (Ax, 1959) Karling, 1980 
France for Baicalellia rectis Ax, 2008 
France for Balgetia hyalina Karling, 1962 
France for Cheliplana deverticula Ax, 2008 
France for Cheliplana deverticula Ax, 2008 
France for Cicerina brevicirrus Meixner, 1928 
France for Halammovortex macropharynx (Meixner, 1938) Karling, 1943 
France for Halammovortex macropharynx (Meixner, 1938) Karling, 1943 
France for Haloplanella minuta Luther, 1946 
France for Haloplanella minuta Luther, 1946 
France for Macrostomum balticum Luther, 1947 
France for Macrostomum balticum Luther, 1947 
France for Macrostomum clavituba Ax, 2008 
France for Macrostomum gallicum Ax, 2008 
France for Macrostomum incurvatum Ax, 2008 
France for Macrostomum spirale Ax, 1956 
France for Paromalostomum mediterraneum Ax, 1955 
France for Paromalostomum mediterraneum Ax, 1955 
France for Phonorhynchoides haegheni Artois & Schockaert, 2001 
France for Phonorhynchus bitubatus Meixner, 1938 
France for Placorhynchus dimorphis Karling, 1947 
France for Placorhynchus octaculeatus octaculeatus Karling, 1931 
France for Promesostoma caligulatum Ax, 1952 
France for Promesostoma caligulatum Ax, 1952 
France for Promesostoma caligulatum Ax, 1952 
France for Promesostoma caligulatum Ax, 1952 
France for Promesostoma rostratum Ax, 1951 
France for Promonotus schultzei Meixner, 1943 
France for Proschizorhynchus gullmarensis Karling, 1950 
France for Provortex psammophilus Ax, 1951 
France for Selimia vivida Ax, 1959 
France for Thylacorhynchus macrorhynchos Ax, 2008 
France for Thylacorhynchus macrorhynchos Ax, 2008 
France for Thylacorhynchus macrorhynchos Ax, 2008 
France for Uncinorhynchus flavidus Karling, 1947 
France for Uncinorhynchus flavidus Karling, 1947 
France for Uncinorhynchus flavidus Karling, 1947 
France for Vejdovskya helictos Ax, 1956 
France for Zonorhynchus tvaerminnensis (Karling, 1931) Karling, 1952 
Germany for Baicalellia brevituba 
Germany for Balgetia hyalina Karling, 1962 
Germany for Balgetia semicirculifera Karling, 1962 
Germany for Canetellia nana Ax, 2008 
Germany for Canetellia nana Ax, 2008 
Germany for Canetellia nana Ax, 2008 
Germany for Canetellia nana Ax, 2008 
Germany for Cicerina tetradactyla Giard, 1904 
Germany for Coronhelmis multispinosus Luther, 1948 
Germany for Eldenia Ax, 2008 
Germany for Eldenia Ax, 2008 
Germany for Eldenia reducta Ax, 2008 
Germany for Eldenia reducta Ax, 2008 
Germany for Haplovejdovskya subterranea Ax, 1954 
Germany for Macrostomum distinguendum Papi, 1951 
Germany for Macrostomum spirale Ax, 1956 
Germany for Messoplana falcata falcata (Ax, 1953) Den Hartog, 1966 
Germany for Messoplana falcata falcata (Ax, 1953) Den Hartog, 1966 

 Status

 for Anthopharynx sacculipenis Ehlers, 1972

Several authors (Armonies, 1987; Hellwig, 1987; Ax, 2008) cast doubts on the identity of this species, and suggest it could ... [details]

 Synonymy

 for Coronhelmis urna Ax, 1954

C. urna was considered a synonym of C. lutheri by Luther (1962), followed by Ehlers (1974). Ax (2008) discusses the ... [details]

 Taxonomic remark

 for Selimia similis Ax, 1959

According to Ax (2008) S. vivida and S. similis could be identical (see Ax, 2008: p. 626) [details]