Agriotes obscurus
This was found by suction sampling. I keyed it using Duff and got to obscurus fairly easily.
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Agriotes obscurus, Wendling Beck Environment Project (Norfolk, UK), 12th March 2025
I found this one in exactly the same place but this time in a pitfall trap.
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Agriotes obscurus showing prosternum and pronotum, Wendling Beck Environment Project (Norfolk, UK), 11th-12th May 2025