Dinaraea angustula

This was in a pitfall trap (in propylene glycol, so no live photos). When I first matched the genitalia to this species I had my doubts as to whether or not it really was this species. Most photos of the species show a dark pronotum and the description in Duff doesn't make it clear that it can be as red as this one seemed to be. After failing to find anything else with genitalia that matched I looked into this species in a bit more detail. Two things alleviated my concern - firstly there are photos of insects captioned as this species which show a similar-coloured pronotum and secondly, although I can't find it illustrated anywhere Duff describes tergite 8 as having four small teeth which seems to match my specimen.

male Dinaraea angustula showing tergite 8 and aedeagus (side and flat views), Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024

This was in a neighbouring pitfall trap (again in propylene glycol, so no live photos) at the same place and time as the one above. The best match to the spermatheca in Duff was actually Dinaraea aequata but there seemed to be a few problems with that ID. The 10th antennal segment was transverse but not twice as wide as long and the species seems to be darker than this one generally. The spermatheca for angustula is shown in Duff as being more tightly coiled but otherwise similar, however there are photos of angustula spermatheca online (assuming they were identified correctly) that show a coil like this one. I think the specimen matches angustula better than aequata so my working assumption is that this is what it is.

female Dinaraea angustula showing spermatheca (2 views) and tip of abdomen, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024