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Foreleg of a male diving beetle (Spike Walker)
Polarised photomicrograph showing the rows of suckers on the foreleg of a male Dytiscus marginalis. Commonly known as the great diving beetle, these are largest freshwater beetles in the UK. They have a large streamlined body that is dark brown in colour, with a yellow abdomen and yellow legs. This image was produced by passing light through coloured filters, a technique known as Rheinberg illumination. (via Wellcome Image Awards 2011)
