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Llyn Gwynant, Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom
latitude: 53.049999 53 03 00 N
longitude: -4.033333 004 02 00 W
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 leucops | Nov 1968 - Oct 1969 | littoral | calcium poor lake (2.6 mg/l). | |
| Castrada neocomensis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (2.6 mg/l). | |
| Castrada viridis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (2.6 mg/l). |