| Macrostomum tuba Graff, 1882 | prior to 1951 | | | |
| Macrostomum tuba gigas Okugawa, 1930 | 1949 | | | in a water tub of a botanical garden, Pisa. Found in every month of the year. |
| Macrostomum tuba gigas Okugawa, 1930 | Oct 9, 1949 | | | in ditches on the periphery of Pisa. Water slowly moving current. |
| Macrostomum tuba gigas Okugawa, 1930 | Oct 17, 1949 | | | in ditches on the periphery of Pisa. Water slowly moving current. |
| Macrostomum tuba gigas Okugawa, 1930 | Jul 10, 1951 | | | in bomb crater with an abundance of water on the periphery of Pisa. pH 6.5, temperature 25 degrees C. |
| Macrostomum viride (1) rostrata Papi, 1951 | Oct 7, 1949 | | | on the outskirts of Pisa, in a pit, stagnant water. |
| Macrostomum appendiculatum Fabricius, 1826 | Nov 9, 1949 | | | outskirts of Pisa, in a closed arm of the Dead River (F.M. Vecchio). In water with variations in salinity. |
| Macrostomum sensitivum Silliman, 1884 | Jun 15, 1951 | | | outskirts of Pisa, in a bomb crater in Piazza d'Armi. Temperature 31 degrees C., pH 6.5 |
| Macrostomum sensitivum Silliman, 1884 | Jul 10, 1951 | | | outskirts of Pisa, in a bomb crater in Piazza d'Armi. Temperature 25 degrees C., pH 6.5 |
| Promacrostomum gieysztori (Ferguson, 1939) | May 15, 1951 | | | outskirts of Pisa, near S. Giuliano present throughout the year. Water temps of 22 and 25 degrees C. pH 7.04 |
| Promacrostomum gieysztori (Ferguson, 1939) | May 15, 1951 | | | outskirts of Pisa, Dead River (Fume Morte), among Fontinalis antipyretica and Spyrogira. Water temperature of 19. pH 6.4 |
| Castrada (Castrada) infernalis Papi, 1951 | Mar 9, 1950 | | | Vorstädte von Pisa. In einem austrocknenden Graben in S. Giusto. |
| Castrada (Castrada) infernalis Papi, 1951 | Mar 16, 1950 | | | Vorstädte von Pisa. In einem austrocknenden Graben in S. Giusto. |
| Castrada (Castrada) infernalis Papi, 1951 | Apr 3-4, 1950 | | | Vorstädte von Pisa. in einem Bombenkrater in Piazz d'Armi, der während eines grossen Teils des Jahres Wasser enthielt. |
| Lutheria moroderi (Gieysztor, 1931) | Oct 25, 1949 | | | in austrocknenden Gräben in der Umgebung von Pisa. beim Friedhof von Pisa. |
| Gieysztoria macrovariata novemspinosa Luther, 1955 | Oct 7, 1949 | | | Italien, Pisa, Graben bei dem Stadtkirchhof. (Papi) |
| Gieysztoria cuspidata (Schmidt, 1861) | 1955 or earlier | | | Umgebung von Pisa. Schwach brackiges Wasser. |
| Macrostomum hystricinum Beklemischev, 1951 | 1951 or earlier | | | Italien Brackwasser in der Umgebung von Pisa |
| Macrostomum rostratum Papi, 1951 | 1960 or earlier | | | Italien, Strassengraben bei Pisa (Papi). |
| Microdalyellia armigera (Schmidt, 1862) | 1952 or earlier | | | Umgeb. v. Pisa. |
| Gieysztoria cuspidata (Schmidt, 1861) | 1952 or earlier | | | Umgebung von Pisa, z.T. in schwach brackigem Wasser, einmal in 31º C, Mai bis November. |
| Gieysztoria rubra (Fuhrmann, 1894) | 1952 or earlier | | | Pisa |
| Castrella (Castrella) truncata (Abildgaard, 1789) | 1952 or earlier | | | Umgebung von Pisa |