| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Gammarus | lacustris | 23 |
| 2 | Gammarus | oceanicus | 12 |
| 3 | Gammarus | pulex | 8 |
| 4 | Gammarus | mucronatus | 8 |
| 5 | Gammarus | locusta | 5 |
| 6 | Gammarus | fasciatus | 5 |
| 7 | Gammarus | lecroyae | 3 |
| 8 | Gammarus | minus | 3 |
| 9 | Gammarus | fossarum | 3 |
| 10 | Gammarus | pseudolimnaeus | 3 |
| 11 | Gammarus | duebeni | 2 |
| 12 | Gammarus | tigrinus | 2 |
| 13 | Gammarus | elvirae | 1 |
| 14 | Gammarus | pecos | 1 |
| 15 | Gammarus | zaddachi | 1 |