Rather mangled specimen which I can't put through the key step by step cos many of the features of the legs are missing. Rather small, length = 4.6 mm. Hairy eyes and long bristles at tip of cercal plate could be Lasiomma seminitidum? Beds. 11 March 2020. Swept from riverside willow.
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I think it must be Lasiomma…
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I think it must be Lasiomma seminitidum Zett. because of the hairy eyes and the simple processes (lobes) of the fifth sternite. The surstyli in profile don't look quite right, but I think that this is because of the angle the photo is taken. The long setae on the cercal plate are also similar to those in seminitidum. I will have another look at the hairy eyes of some specimens of seminitidum to check the length as I don't recall them as being that long, but it is some time since I looked at one.