Bytrask (Byträsk), Finland
latitude: 59.9333 59°55'59.88"N
longitude: 23.4333 23°25'59.88"E
[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]
| Stenostomum unicolor constrictum Luther, 1960 | prior to 1960 | |||
| Polycelis tenuis Ijima, 1884 | 1961 or earlier | N. [map reference area, p. 42] ; | ||
| Castrada (Castrada) stagnorum Luther, 1904 | 1963 or earlier | Ekenäs: Gullö Byträsk. | ||
| Mesostoma lingua (Abildgaard, 1789) | 1963 or earlier | Gullö Byträsk, Sandstrand mit Lobelia, 21 º C | ||
| Bothromesostoma essenii Braun, 1885 | 1963 or earlier | |||
| Microstomum lineare (Müller, 1773) | 1960 or earlier | Gullö Byträsk |
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