Common Whirligig Gyrinus substriatus
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Common Whirligig Gyrinus substriatus, North Elmham (Norfolk, UK), 4th July 2018
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male Common Whirligig Gyrinus substriatus showig scutellum, side of elytron, apex of elytron, side of pronotum and aedeagus, Wendling Beck Environment Project (Norfolk, UK), 21st September 2024
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Common Whirligig Gyrinus substriatus, North Elmham Cathedral Meadows (Norfolk, UK), 30th June 2019
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Common Whirligig Gyrinus substriatus, North Elmham (Norfolk, UK), 16th July 2019
The above beetles either came to light or were netted in flight, but I see Whiligigs more often on the surfacfe of the water. Unfortunately when they're doing this I can't see sufficient detail to identify them. I imagine they're most likely substriatus, but can't assume that's the case.
2x Gyrinus sp., North Elmham Cathedral Meadows (Norfolk, UK), 24th April 2020