| Anaperus tvaerminnensis (Luther, 1912) | prior to 1960 |  |  | between Jovskär and Vikarskär, 60 cm deep.  (Papi) | 
| Dolichomacrostomum uniporum Luther, 1947 | Jun 18, 1944 |  | sand, gyttia | sand bank between the Islands of Vikarskär and Jovskär near Tvärminne, 30-35 cm deep. | 
| Macrostomum balticum Luther, 1947 | prior to 1960 | 2.5-3.0 m | sand, gyttja | between Vikarskär and Långholmen.  All specimens found between June and August. | 
| Macrostomum balticum Luther, 1947 | prior to 1960 | 0.5 m | sand, gyttja | between Vikarskär and Jovskär.  All specimens found between June and August. | 
| Macrostomum curvituba Luther, 1947 | prior to 1960 |  |  |  | 
| Monocelis lineata (Müller, 1773) | prior to 1960 |  |  | between Vikarskär and Langholmen. | 
| Promonotus schultzei Meixner, 1943 | prior to 1960 |  |  | Krogarviken: north of Vikarskär. | 
| Minona baltica Karling & Kinnander, 1953 | prior to 1960 |  |  |  | 
| Bothriomolus balticus Meixner, 1938 | prior to 1960 |  | fine sand | west bay. | 
| Macrostomum hamatum Luther, 1947 | Aug 31, 1943 |  | sand, rock | southern bank.   Vegetation includes Scirpus uniglumis, Juncus Gerardi, Aster tripolium, Phragmites.  3 specimens. | 
| Tvaerminnea karlingi Luther, 1943 | Aug 1936 | 0.2-7.0 m | sand | found on sand bottoms, pushes through sand grains.  Between the Zoological Station and Vikarskär. | 
| Bresslauilla relicta Reisinger, 1929 | 1961 or earlier |  | fine sand | 18 degrees C., 2 specimens. | 
| Provortex pallidus Luther, 1948 | 1962 or earlier |  |  |  | 
| Provortex karlingi Ax, 1951 | 1962 or earlier |  |  | between Långholmen and Vikarskär. | 
| Baicalellia brevitubus (Luther, 1918) | 1962 or earlier |  |  | plants, sea shore rocky promontory zone.  Between Vikarskär and Jovskär. | 
| Baicalellia beauchampi (Ax, 1956) | 1962 or earlier |  | sand | between Vikarskär and Jovskär, detritus containing sand, 30-40 cm.  Papi. | 
| Baicalellia pusilla (Luther, 1962) | 1962 or earlier |  |  | between Jovskär and Vikarskär, 15-20l cm deep. | 
| Brinkmanniella macrostomoides Luther, 1948 | 1962 or earlier |  |  | between Långholmen and Vikarskär. | 
| Coronhelmis multispinosus Luther, 1948 | 1962 or earlier |  |  | Sandbank. | 
| Koinocystis tvaerminnensis Karling, 1931 | Aug 1929 - Mar 1930 | 1 m |  | Diese Art fand ich in geringer Anzahl dicht bei den Inseln Jofskär und Vikarskär in einer Tiefe von ungefähr 1 m.  Der Boden war feiner Sand ohne Vegetation.  In denselben Proben fand ich auch Placorhynchus und Proxenetes flabellifer. | 
| Placorhynchus octaculeatus Karling, 1931 | Aug 1929 - Mar 1930 | 1 m | sand | Krogarviken Bay, and the Islands of Jofskär and Vikarskär. | 
| Acrorhynchus robustus Karling, 1931 | Jun 1929 |  |  | in the Sound between the Islands of Jofskär and Vikarskär. | 
| Thalassoplanella collaris Luther, 1946 | 1946 or earlier |  |  | shallow water and in wet bank soil with Gyttja and humus. | 
| Anthopharynx vaginatus Karling, 1940 | 1963 or earlier | 3 m | Sand, mud | N. Tvärminne-Gebiet:  Zwischen Vikarskär und Långholmen, Sand mit Schlick (A.L.) | 
| Castrada (Castrada) lanceola (Braun, 1885) | 1963 or earlier |  |  | Umgebung der Zool. Station Tvärminne:  zwischen Långholmen u. Vikarskär; | 
| Castrada (Castrada) subsalsa Luther, 1946 | 1963 or earlier |  |  | Vikarskär | 
| Gieysztoria infundibuliformis (Fuhrmann, 1894) | 1955 or earlier |  |  | Storlandet, vegetationsreicher Tümpel |