Details
| Catalogue no.: | UPSZMC 185548 |
| Taxon: | Mergus merganser Linnaeus, 1758 |
| Label: | Mergus merganser |
| Collector: | Arwidsson, I. |
| Date: | 1934 06 23 |
| Country: | Sweden |
| Province: | Södermanlands län |
| Landskap: | Södermanland |
| Socken: | Mariefred |
| Locality: | Mariefredsviken |