Potamopyrgus antipodarum. Male from population with highest recorded % of males in Europe. Flexed penis with longitudinal band of wavy white on grey. September 2012. Llanfihangel, Wales. For further information click “View Image Details”

Submitted by Ian Smith on Thu, 27/12/2012 19:55
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I.F. Smith
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Map name is Llanfihangel y Traethau, but road signs and study by C. Wallace refer to village as “Ynys”. In 1980, 1981 & 1983 Wallace recorded 16%, 8.5% and 19% males, respectively, at a sharp bend in the A4573 where a bridge carries it over the stream that flows alongside Ynys village (sample sizes 331 – 1116). In 2012 twenty specimens were examined before a male was found. 20% males were found a little upstream in 1983, the highest proportion of males found in Europe.