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Llyn Ogwen, Caernarvonshire (Caernarvon, Carnarvonshire, Arfon), North Wales, United Kingdom
latitude: 53.116669 53 07 00 N
longitude: -4 004 00 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 grabbskogense | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Stenostomum leucops | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Stenostomum unicolor | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Prorhynchus stagnalis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Geocentrophora baltica | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Geocentrophora sphyrocephala | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Microdalyellia armigera | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Gieysztoria infundibuliformis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Castrada luteola | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Castrada neocomensis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Castrada viridis | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Strongylostoma elongatum | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Rhynchomesostoma rostratum | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Gyratrix hermaphroditus | Nov 1968 - Oct 1969 | littoral | calcium poor lake (0.4 mg/l). | |
| Gieysztoria infundibuliformis | Jul 1969 | littoral zone of upland, calcium-poor 'unproductive' lakes in Caernarvonshire, N. Wales. |