| Convoluta convoluta (Abildgaard, 1806) | prior to 1905 | littoral | | |
| Proxenetes flabellifer Jensen, 1878 | 1913 or earlier | | | beach water. |
| Promesostoma marmoratum marmoratum (Schultze, 1851) | 1913 or earlier | | | very active, in marine and brackish water. |
| Promesostoma marmoratum (Schultze, 1851) | 1913 or earlier | | | very active, in marine and brackish water. |
| Trigonostomum armatum (Jensen, 1878) | 1913 or earlier | 0-27 m | | found in Fucus at depths up to 27 m. |
| Trigonostomum penicillatum (Schmidt, 1857) | 1913 or earlier | | | |
| Polycystis naegelii Kölliker, 1845 | 1913 or earlier | | | living among plants in the litoral zone. |
| Polycystis crocea (Fabricius, 1826) | 1913 or earlier | | | |
| Phonorhynchus helgolandicus (Metschnikow, 1865) | 1913 or earlier | | | |
| Plagiostomum girardi (Schmidt, 1857) | 1913 or earlier | | | slow acting and swimming, in waste water and aquariums. |
| Plagiostomum vittatum (Frey & Leuckart, 1847) | 1913 or earlier | | | |
| Plagiostomum koreni Jensen, 1878 | 1913 or earlier | | | |
| Vorticeros auriculatum (Müller, 1784) | 1913 or earlier | 0-35m | | littoral up to 35 m deep in Algen and Bryozoen. |
| Pseudostomum quadrioculatum (Leuckart, 1847) | 1913 or earlier | | | |
| Monocelis fusca Örsted, 1843 | 1913 or earlier | | | |
| Monocelis lineata (Müller, 1773) | 1913 or earlier | | | |