| site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | |
|---|---|---|---|---|---|---|---|---|---|
| A | Switzerland (Schweiz) | 2455 | 1913 or earlier | freshwater | Graff Lvon (1913): 118 | ||||
| B | Leningrad Province (Sankt-Peterburg, Saint Petersburg), Russia | 3893 | 1926 or earlier | Leningrad province. | Nasonov NV (1926): abstract | ||||
| C | Almenara, Spain | 5116 | Sep 1929 | Almenara. | Gieysztor M (1931): 142 |