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Traeth Bach (Traeth Bychan), Anglesey, North Wales, United Kingdom
latitude: 52.900002     52 54 00 N
longitude: -4.116667     004 07 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 
| Diopisthoporus longitubus | 1958-1961 | intertidal | coarse sand, fine shell gravel | 2 specimens at LWN. | 
| Dolichomacrostomum uniporum | 1958-1961 | medium sand with fine shell gravel | rare at ELWS. | |
| Brinkmanniella macrostomoides | 1958-1961 | fine shell gravel, coarse sand | occasional at halfway between LWN and MTL. | |
| Proxenetes simplex | 1958-1961 | coarse sand, fine shell gravel | occasional at LWN. | |
| Tvaerminnea karlingi | 1958-1961 | coarse sand, fine shell gravel | occasional at LWN. Note: previously other authors Luther, French, and Ax found this species in low salinity water. | |
| Vejdovskya pellucida | 1958-1961 | fine shell gravel | occasional at HWM. | |
| Monocelis lineata | 1958-1961 | coarse sand with fine shell gravel. | one specimen at LWN. | |
| Nematoplana coelogynoporoides | 1958-1961 | intertidal | fine shell gravel, coarse sand | LWN, common. | 
| Nematoplana coelogynoporoides | 1958-1961 | intertidal | fine shell gravel, coarse sand | MTL, frequent. | 
| Nematoplana coelogynoporoides | 1958-1961 | intertidal | fine shell gravel | HWN, from pool, common. | 
| Parotoplana capitata | 1958-1961 | intertidal | fine shell gravel, coarse sand | MTL, common. | 
| Parotoplana capitata | 1958-1961 | intertidal | fine shell gravel, coarse sand | HWN, from pool, common. | 
| Polystyliphora filum | 1958-1961 | intertidal | medium sand, fine shell gravel | LWN 1/2 MTL, 10 cm below sand surface, rare. |