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Oka, Russia
latitude: 55.989166
longitude: 58.250278
Precision of location: Alexandria Digital Library (with NGA GNDB data)
Site Named Here: By name of island, bay, strait, lake, river, or stream, etc., named in source publication
| Pseudosyrtis fluviatilis | 1935 or earlier | In Flusssanden der Weichsel, des Pripet und der Oka. | ||
| Plagiostomum lemani | 1940 or earlier | Oka. |