| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Hydrobia | acuta | 24 |
| 2 | Hydrobia | ventricosa | 21 |
| 3 | Hydrobia | n-sp 1 | 19 |
| 4 | Hydrobia | glyca | 11 |
| 5 | Hydrobia | totteni | 10 |
| 6 | Hydrobia | grimmi | 9 |
| 7 | Hydrobia | stagnalis | 8 |
| 8 | Hydrobia | procerula | 7 |
| 9 | Hydrobia | truncata | 5 |
| 10 | Hydrobia | minuta | 4 |
| 11 | Hydrobia | elongata | 3 |
| 12 | Hydrobia | albonensis | 3 |
| 13 | Hydrobia | cornea | 3 |
| 14 | Hydrobia | viridescens | 2 |
| 15 | Hydrobia | nana | 2 |
| 16 | Hydrobia | buccinoides | 2 |
| 17 | Hydrobia | achaja | 2 |
| 18 | Hydrobia | valenciae | 2 |
| 19 | Hydrobia | victoriae | 2 |
| 20 | Hydrobia | salsa | 1 |
| 21 | Hydrobia | ventrosa | 1 |
| 22 | Hydrobia | cattaroensis | 1 |
| 23 | Hydrobia | ukadoi | 1 |
| 24 | Hydrobia | kutschigi | 1 |