Crpyptophagus uncinatus

I found ths beetle (2.1mm) on a wooden fencepost on the side of the post but near the top. It keys to uncinatus using both Duff and Hackston, but I note that (a) uncinatus is rarely recorded in Norfolk and (b) Duff states that badius, reflexus, scanicus and uncinatus are only safely separable on male genitalic characters. This has five segments on its hind tarsus and I believe that makes it a female so the implication seems to be that this isn't reliably identified. That said, uncinatus is separated from the other three species in having larger punctures on the head and I measured these at about 15μm which is at the upper end of the range given for uncinatus - the other three species supposedly being 9-10μm (I measured the punctures on the sides of the vertex - the ones on the centre of the frons were smaller). So I'm open to advice as to whether or not I should record this as uncinatus, and have kept the specimen in case the CR or anyone else would like to review it.

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apparent female Crpyptophagus uncinatus showing pronotum, hind tarsus, antenna and head puncturing, North Elmham railway (Norfolk, UK), 25th February 2025