Colymbetes fuscus
Most of my recent records were identified using Duff's key and Mike Hackston's, or just Duff's, but the older ones were only using Mike Hackston's keys.
This came to light in a meadow and was 15.7mm long. The close-up shows the transvere pattern on the elytra that, together with the large size, eliminate the trickier genus Rhantus.
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Colymbetes fuscus, Wendling Beck Environment Project (Norfolk, UK), 21st September 2024
Most of the rest were in my garden, I think all coming to light.
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Colymbetes fuscus, North Elmham (Norfolk, UK), 13th August 2022
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Colymbetes fuscus, North Elmham (Norfolk, UK), 14th August 2022
Colymbetes fuscus, North Elmham (Norfolk, UK), 25th August 2022
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Colymbetes fuscus, North Elmham (Norfolk, UK), 29th December 2021
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Colymbetes fuscus, North Elmham (Norfolk, UK), 6th August 2018
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Colymbetes fuscus, North Elmham Cathedral Meadows (Norfolk, UK), 25th May 2019