| Cincinnatia Pilsbry, 1891 |
| Cincinnatia integra (Say, 1829) |
| Fontelicella Gregg & Taylor, 1965 |
| Fontelicella cedrosensis (Pilsbry, 1927) |
| Hydrobia Hartmann, 1821 |
| Hydrobia monroensis Frauenfeld, 1863 |
| Hydrobia seemani Frauenfeld, 1863 |
| Hydrobia texana Pilsbry, 1887 |
| Hydrobia totteni Morrison, 1954 |
| Hydrobia truncata (Vanatta, 1924) |
| Hydrobiidae Stimpson, 1865 |
| Hydrobiinae Stimpson, 1865 |
| Nymphophilinae Taylor, 1966 |
| Nymphophilus Call & Pilsbry, 1886 |
| Nymphophilus acarinatus Hershler, 1985 |
| Nymphophilus minkleyi Taylor, 1966 |
| Paludestrina d'Orbigny, 1840 |
| Paludestrina truncata Vanatta, 1924 |
| Pyrgulinae Brusina, 1882 |
| Pyrgulopsis Call & Pilsbry, 1886 |