| umbra pygmaea | | usa: maryland, anne arundel county, patuxent river, jug bay wetlands sanctuary, two-run branch | | 1842676958 |
| umbra pygmaea | | usa: maryland, caroline county, choptank river, gravelly branch, downstream site | | 1842677612 |
| umbra pygmaea | | usa: maryland, caroline county, choptank river, gravelly branch, upstream site | | 1842677809 |
| umbra pygmaea | | usa: maryland, caroline county, choptank river, gravelly branch, upstream site | | 1842676724 |
| umbra pygmaea | | usa: maryland, caroline county, choptank river, gravelly branch, downstream site | | 1842676722 |
| umbra pygmaea | | usa: maryland, caroline county, choptank river, gravelly branch, upstream site | | 1842678305 |