| Archaphanostoma agile (Jensen, 1878) | | 5-10 m (0-40 m) | | |
| Convoluta convoluta (Abildgaard, 1806) | prior to 1905 | littoral | | |
| Aphanostoma virescens (Ørsted, 1845) | 1844 or earlier | | | |
| Aphanostoma rhomboides Jensen, 1878 | 1844 or earlier | | | |
| Convoluta paradoxa Ørsted, 1843 | 1844 | | | |
| Proporus lonchitis Dörjes, 1971 | Aug 1955 | 50-200 m | | |
| Acmostomum dioicum Metschnikoff, 1865 | 1955 or earlier | | seaweed | common on the West Coast of Scandinavia. |
| Plagiostomum vittatum (Frey & Leuckart, 1847) | 1955 or earlier | | | |
| Anoplodium stichopi Bock, 1925 | | | | Near the Biological Stations. In body cavity of Stichopus tremulus, similar habitat as Anoplodium parasita. Most numerous in samples from Kristianiafjord. |
| Meara stichopi Westblad, 1949 | prior to 1923 | | | Westblad notes that Bock found this species in Dröbak. Host Stichopus tremulus Gunn. |
| Childia groenlandica (Levinsen, 1879) | prior to 1975 | | | Zostera |
| Haploposthia viridis (An der Lan, 1936) | prior to 1946 | 200 m | soft bottom | |
| Nemertoderma bathycola Steinböck, 1930 | prior to 1975 | 45-400 m | soft bottom | |
| Childia dubium (Westblad, 1942) | prior 1975 | 50-100 m | | Skipelle. |
| Monocelis fusca Örsted, 1843 | 1913 or earlier | | | |
| Monocelis lineata (Müller, 1773) | 1913 or earlier | | | |
| Ulianinia westbladi Karling, 1963 | 1963 or earlier | | | Drøbak, Degerud. 1 specimen. |
| Trisaccopharynx westbladi Karling, 1940 | 1935 | 10 m | loam | in the summer. near Drøbak, Hallangspollen Bay. |
| Trisaccopharynx westbladi Karling, 1940 | 1936 | 10 m | loam | in the summer. near Drøbak, Hallangspollen Bay. |
| Gyratrix proavus Meixner, 1929 | prior to 1954 | 150 m | | Dröbak, Lehmboden bei Westmeist, 150 m Tiefe. |
| Globuliphora rufifrons Westblad, 1952 | Jul 1935 | 150-200 m | | Drøbak at the Vestmeiet depth. |
| Leptoplana droebachensis Ørsted, 1845 | 1844 or earlier | | | Kjønsmodne Individer. Ørsted har fundet den ved Drøbak. |
| Aphanostoma rhomboides Jensen, 1878 | 1905 or earlier | | | Kristiania-Fjord (Dröbak) |