| Mesostoma ehrenbergii (Focke, 1836) | Apr 1943 | | mud | found in a pond near the river Tieté in suburb of the city of Sao Paulo, most individuals with summer-eggs, only a small number with thick-shelled eggs. / plants: Eichhornia and Salvinia |
| Catenula lemnae Duges, 1832 | prior to 1945 | | | various times, found with Spirostomum ambigum. |
| Catenula alitha Marcus, 1945 | prior to 1945 | | | |
| Catenula leuca Marcus, 1945 | prior to 1945 | | | |
| Dasyhormus lasius Marcus, 1945 | prior to 1945 | | | |
| Dasyhormus lithophorus Marcus, 1945 | prior to 1945 | | | |
| Catenula turgida (Zacharias, 1902) | prior to 1945 | | | |
| Catenula evelinae (Marcus, 1945) | prior to 1945 | | | |
| Catenula sawayai (Marcus, 1945) | prior to 1945 | | | |
| Chordarium evelinae Marcus, 1945 | prior to 1945 | | | |
| Chordarium leucanthum Marcus, 1945 | prior to 1945 | | | |
| Chordarium philum Marcus, 1945 | prior to 1945 | | | |
| Stenostomum bicaudatum Kennel, 1888 | prior to 1945 | | | |
| Weldonia paraguayensis Martin, 1908 | prior to 1945 | | | |
| Stenostomum tenuicauda Graff, 1911 | prior to 1945 | | | |
| Stenostomum tauricum Nasonov, 1924 | prior to 1945 | | | |
| Anokkostenostomum membranosum (Kepner & Carter, 1931) | prior to 1945 | | | |
| Stenostomum ciliatum Kepner & Carter, 1931 | prior to 1945 | | | |
| Anokkostenostomum saliens (Kepner & Carter, 1931) | prior to 1945 | | | |
| Stenostomum arevaloi Gieysztor, 1931 | prior to 1945 | | | |
| Stenostomum amphotum Marcus, 1945 | prior to 1945 | | | |
| Anokkostenostomum anatirostrum (Marcus, 1945) | prior to 1945 | | | |
| Rhynchoscolex simplex Leidy, 1852 | prior to 1945 | | | |
| Rhynchoscolex evelinae Marcus, 1945 | prior to 1945 | | | |
| Rhynchoscolex platypus Marcus, 1945 | prior to 1945 | | | |
| Rhynchoscolex pusillus Marcus, 1945 | prior to 1945 | | | |
| Chordarium cryptum Marcus, 1945 | Jan & Apr, 1944 | | | |