| Xenacoela Acoela Uljanin, 1870 | | w | other taxonomic work | |
| Prolecithophora Cylindrostomidae Reisinger, 1924 | | w | other taxonomic work | |
| Cylindrostoma klostermanni (2) Pereyaslawzewa, 1892 | | w | latest taxonomic authority | |
| Monoophorum granulosum Beklemischev, 1927 | | w | latest taxonomic authority | |
| Monoophorum ruseri Reisinger, 1926 | | w | latest taxonomic authority | |
| Protomonotresinae Protomonotresis Reisinger, 1924 | | w | latest taxonomic authority | |
| Pseudostomum dubium Graff, 1911 | | w | latest taxonomic authority | |
| Pseudostomum elegans (Pereyaslawzewa, 1892) | | w | latest taxonomic authority | |
| Acmostomum dioicum Metschnikoff, 1865 | [with synonyms] | w | latest taxonomic authority | |
| Acmostomum sarsii (Jensen, 1878) | | w | latest taxonomic authority | |
| Acmostomum tergestinum Steinböck, 1933 | | w | latest taxonomic authority | |
| Plagiostomidae Alvaera Bock, 1923 | | w | latest taxonomic authority | |
| Plagiostomum hartmeyeri Weiss, 1909 | | w | latest taxonomic authority | |
| Plagiostomum lutheri Bohmig, 1914 | | w | latest taxonomic authority | |
| Plagiostomum micropharynx An der Lan, 1936 | | w | latest taxonomic authority | |
| Plagiostomum obscurum An der Lan, 1936 | | w | latest taxonomic authority | |
| Plagiostomum opisthogonimum Reisinger, 1926 | | w | latest taxonomic authority | |
| Plicastoma lutheri (Bohmig, 1914) | [with synonyms] | w | latest taxonomic authority | |
| Plicastoma micropharynx (An der Lan, 1936) | [with synonyms] | w | latest taxonomic authority | |
| Kirgisellinae Kirgisella Beklemischev, 1927 | | w | latest taxonomic authority | |
| Brunetia camarguensis (Brunet, 1965) | [with synonyms] | w | other taxonomic work | |
| Marirhynchus longasaeta Schilke, 1970 | | w | latest taxonomic authority | |
| Opistomum oculata Pereyaslawzewa, 1892 | | w | latest taxonomic authority | |
| Xenacoelomorpha Nemertodermatida Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Adiaphanida Prolecithophora Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Prolecithophora Combinata Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Scleraulophoridae Scleraulophorus Karling, 1940 | | w | primary taxonomic authority (describer) | 55-61 |
| Scleraulophorus cephalatus Karling, 1940 | | w | primary taxonomic authority (describer) | 55-61 |
| Protomonotresinae Prolecithoplana Karling, 1940 | | w | primary taxonomic authority (describer) | 15 |
| Prolecithoplana lutheri Karling, 1940 | | w | primary taxonomic authority (describer) | 15-26, textfigs. 1-2, Figs. 1-5 |
| Prolecithophora Multipeniatidae Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Plagiostomum norvegicum (Karling, 1940) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Plagiostomum torquatum Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Plicastoma norvegicum Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Neokirgellinae Hangethellia Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Hangethellia calceifera Karling, 1940 | | w | primary taxonomic authority (describer) | 98-114, 237-238, figs. 11-12, 17 (1-4), t. 9-10 |
| Hangethellia calceifera calceifera Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Hangethellia calceifera norwegica Karling, 1940 | | w | primary taxonomic authority (describer) | 14, 98-114, textfig. 11-12; T. IX; T. X; T. XVII, |
| Anthopharynginae Anthopharynx Karling, 1940 | | w | primary taxonomic authority (describer) | 114 |
| Anthopharynx vaginatus Karling, 1940 | | w | primary taxonomic authority (describer) | 14, 114-133; textfigs. 13-14; T. XI-XII; T. XVII, |
| Solenopharynginae Trisaccopharynx Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Trisaccopharynx westbladi Karling, 1940 | | w | primary taxonomic authority (describer) | 14, 114-133; textfigs. 13-14; T. XI-XII; T. XVII, |
| Macrostomorpha Macrostomida Karling, 1940 | | w | primary taxonomic authority (describer) | |
| Plagiostomum violaceum Fuhrmann, 1896 | | w | other taxonomic work | |
| Plagiostomidae Vorticerotinae Reisinger, 1924 | | w | latest taxonomic authority | 62 |
| Cylindrostomidae Allostominae Graff, 1882 | | w | other taxonomic work | |
| Hofstenia atroviridis Bock, 1923 | [with synonyms] | w | other research on this sp. | p 144, 139, 187, 203, 211 |
| Provortex balticus (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 14, 98-114, 146, 147, 204, 208, 218, 223, 233, 240 |
| Baicalellia brevitubus (Luther, 1918) | [with synonyms] | w | other taxonomic work | 204 |
| Pseudostomum klostermanni (Graff, 1874) | [with synonyms] | w | other taxonomic work | 26-40, textfig. 3, T. II-III, T. XIII, figs. 6-7 |
| Pseudostomum quadrioculatum (Leuckart, 1847) | [with synonyms] | w | other taxonomic work | 13, 26-41 |
| Enterostomula dura (Fuhrmann, 1896) | | w | other taxonomic work | 13, 41-54, textfig. 4, T. IV, V, XIV; T. XIII, fig |
| Opistomum arsenii Nasonov, 1917 | | w | other taxonomic work | |
| Provortex tubiferus Luther, 1948 | | w | other taxonomic work | 98-114, text and figs. |
