| Monochoerus illardatus Lohner & Micoletzky, 1911 | 1911 or earlier | planktonic, pelagic | | open sea plankton in Istrian waters. found by Triest after south storms, but found regularly at Rovigno. |
| Adenopea illardata (Lohner & Micoletzky, 1911) | 1911 or earlier | planktonic, pelagic | | open sea plankton in Istrian waters. found by Triest after south storms, but found regularly at Rovigno. |
| Acmostomum dioicum Metschnikoff, 1865 | 1952 | | | |
| Nemertoderma psammicola Sterrer, 1970 | May 8, 1966 | 3-4 m | coarse sand with detritus | collected by Rieger. off train station. |
| Annulorhynchus adriaticus Karling, 1956 | 1956 or earlier | 35 m | clay (Lehmboden) | Southwest of Isola Lunga. |
| Plagiostomum obscurum An der Lan, 1936 | 1936 or earlier | | | |
| Allostoma pallidum f.pusillum Westblad, 1955 | Jun 7, 1952 | 20 m | mud | the biology station. |
| Microstomum melanophthalmum Steinböck, 1933 | 1952 or earlier | | | marine caves. |
| Faerlea fragilis Westblad, 1945 | 1956 or earlier | | | |
| Pseudaphanostoma variabilis Westblad, 1946 | 1956 or earlier | 35 m | | |
| Childia cycloposthium (Westblad, 1942) | 1956 or earlier | 10-50 m | | |
| Notomonoophorum coecum Luther, 1948 | 1956 or earlier | | sand clay | |
| Polycystis steueri Steinböck, 1933 | 1933 or earlier | | coarse sand, shells | |
| Otocelis rubropunctata (Schmidt, 1852) | 1933 or earlier | 18 m | mud | in bay south of S. Pelagio. Also, Ulven near the Station building. |
| Convoluta saliens (Graff, 1882) | 1933 or earlier | 28-30 m | mud, sand | southwest of Rovigno. |
| Aphanostoma diversicolor Ørsted, 1845 | 1933 or earlier | 18-20 m | mud | south fo S. Pelagio. |
| Aphanostoma diversicolor Ørsted, 1845 | 1933 or earlier | | | on Ulven near the Station building. |
| Convoluta hipparchia Pereyaslawzewa, 1892 | 1933 or earlier | | | Ulven by Station building. |
| Convoluta pelagica Lohner & Micoletzky, 1911 | 1933 or earlier | | | |
| Stenostomum leucops (Duges, 1828) | 1933 or earlier | | | shady pool in clear water in Hütteroth Park. |
| Stenostomum agile Silliman, 1885 | 1933 or earlier | | | shady pool in clear water in Hütteroth Park. |
| Microstomum ornatum Uljanin, 1870 | 1933 or earlier | | | Ulven near Station building. |
| Phaenocora unipunctata (Ørsted, 1843) | 1933 or earlier | | mud | shady pools in Hütteroth Park. |
| Trigonostomum setigerum Schmidt, 1852 | 1933 or earlier | | | Ulven near the Station building. |
| Proxenetes gracilis Graff, 1882 | 1933 or earlier | | | Ulven near the Station building. |
| Proxenetes flabellifer Jensen, 1878 | 1933 or earlier | 28-30 m | mud | southwest of Rovigno. |
| Promesostoma marmoratum (Schultze, 1851) | 1933 or earlier | | | Ulven near Station. |
| Promesostoma solea (Schmidt, 1857) | 1933 or earlier | 28-30 m | mud | southwest of Rovigno. |
| Plagiostomum maculatum Graff, 1882 | 1933 or earlier | | | few specimens. |
| Plagiostomum maculatum Graff, 1882 | 1933 or earlier | 28-30 m | mud | southwest of Rovigno. |
| Pseudostomum inerme (Hallez, 1879) | 1933 or earlier | | | few specimens. in Ulven at the Station. |
| Thysanozoon brocchii (Risso, 1818) | Nov 23, 1932 | | | 2 specimens, Bryozoan ship vegetation. |
| Pseudoceros velutinus (Blanchard, 1847) | 1933 or earlier | | | |
| Pseudoceros maximus Lang, 1884 | 1933 or earlier | 30 m | mud | 1 specimen. |
| Cycloporus papillosus (1) Sars, 1878 | Mar 21, 1925 | 15 m | sand, rock | west of the Port Monsena, Station 84, sampling of A. Vatova. |
| Castrada (Castrada) sp. Steinböck, 1933 | 1933 or earlier | | | 1 specimen, shady pool of clear water at the Hütteroth Park. |
| Polycystis crocea (Fabricius, 1826) | 1933 or earlier | | sand, mud | 1 specimen, Bay of Faborso. |
| Monticellina longituba Westblad, 1953 | 1952 | | | found in sea-cucumber Holothuria impatiens at the Rovinj Biological Station. |
| Austromacrostomum sp. Rieger, 1977 | prior to 1977 | | | Rovinj, Istria (same location as type locality of M. bistylifera Rieger, 1968). |
| Rogneda westbladi Karling, 1953 | 1953 or earlier | 4-35 m | | Adriatique (Rovigno), entre 4 et 35 m de profondeur, dans un sol sableux a graveleux et meme argileux. |
| Phaenocora unipunctata (Ørsted, 1843) | 1933 or earlier | | | Jugoslavien: Rovigno |
| Rogneda minuta Uljanin, 1870 | 1933 or earlier | | | Algae |