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Bytrask (Byträsk), Finland
latitude: 59.9333
longitude: 23.4333
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
| unicolor constrictum | prior to 1960 | |||
| Polycelis tenuis | 1961 or earlier | N. [map reference area, p. 42] ; | ||
| Castrada stagnorum | 1963 or earlier | Ekenäs: Gullö Byträsk. | ||
| Mesostoma lingua | 1963 or earlier | Gullö Byträsk, Sandstrand mit Lobelia, 21 º C | ||
| Bothromesostoma essenii | 1963 or earlier | |||
| Microstomum lineare | 1960 or earlier | Gullö Byträsk |