Mesopsocus immunis
Although listed as uncommon, this doesn't seem to be the case round here. I catch the species regularly at light and have found quite a few in the daytime too.
Females are unwinged, and therefore harder to find compared to males. This is the only one I've seen, found on the trunk of a Pedunculate Oak tree.
, Cathedral Meadows, 18-Jun-20 (A) (2).jpg)
, Cathedral Meadows, 18-Jun-20 (A) (1).jpg)
, Cathedral Meadows, 18-Jun-20 (A) (3).jpg)
female Mesopsocus immunis showing subgenital plate, North Elmham Cathedral Meadows (Norfolk, UK), 18th June 2020
Only the males are winged, so these make up all of my records at light (and most of other records too).
male Mesopsocus immunis, North Elmham (Norfolk, UK), 29th May 2019
Males are supposed to be separable from other Mesopsocus species by the lobes on the paramere (the end lobe being longer on laticeps and the side lobe being more prominent on unipunctatus).
, Dillington Carr, 14-May-25 (A) (1).jpg)
, Dillington Carr, 14-May-25 (A) (2).jpg)
, Dillington Carr, 14-May-25 (A) (3).jpg)
, Dillington Carr, 14-May-25 (A) (4).jpg)
male Mesopsocus immunis showing parameres, Wendling Beck Project (Norfolk, UK), 14th May 2025
, North Elmham, 14-May-24 (A) (1).jpg)
, North Elmham, 14-May-24 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 14th May 2024
There seems to be quite a bit of variation in the extent to which the side lobes are prominent and in some individuals the side lobes are considerably more prominent than they are shown at the Barkfly Recording Scheme key or in New. But I don't think these can be unipunctatus - the side lobes of that species are shown as much bigger in both the BRC key and New, and the paramere narrows abruptly below the lobes, whereas on these the paramere is of relatively even width for some distance below and including the side lobe.
, North Elmham, 28-Jun-21 (A) (1).jpg)
, North Elmham, 28-Jun-21 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 28th June 2021
On the forewing of Mesopsocus laticeps veins Rs and M may be fused for a short distance, whereas immunis the four vein parts are supposed to almost meet at a point. On the majority of immunis that I've found the four vein parts do indeed meet at a point whereas on this one there was a short section where Rs and M are fused, so I hoped it might be a laticeps. Sadly the end lobes do not appear to be long enough, so I think it must just be another immunis.
, North Elmham, 22-May-26 (A) (1).jpg)
, North Elmham, 22-May-26 (A) (2).jpg)
, North Elmham, 22-May-26 (A) (3).jpg)
male Mesopsocus immunis showing parameres and wings, North Elmham (Norfolk, UK), 22nd May 2026
This is a more typical individual showing the veins meeting in a point.
, North Elmham, 12-May-25 (A) (1).jpg)
, North Elmham, 12-May-25 (A) (2).jpg)
, North Elmham, 12-May-25 (A) (3).jpg)
male Mesopsocus immunis showing parameres and wings, North Elmham (Norfolk, UK), 12th May 2025
, Badger Pit Wood, 26-May-25 (A) (1).jpg)
, Badger Pit Wood, 26-May-25 (A) (2).jpg)
, Badger Pit Wood, 26-May-25 (A) (3).jpg)
, Badger Pit Wood, 26-May-25 (A) (4).jpg)
male Mesopsocus immunis showing parameres, Wendling Beck Project (Norfolk, UK), 26th May 2025
, Dillington Carr, 26-May-23 (A) (1).jpg)
, Dillington Carr, 26-May-23 (A) (2).jpg)
, Dillington Carr, 26-May-23 (A) (3).jpg)
male Mesopsocus immunis showing parameres, Wendling Beck Project (Norfolk, UK), 26th May 2024
, Dillington Carr, 26-May-23 (B) (1).jpg)
, Dillington Carr, 26-May-23 (B) (2).jpg)
second male Mesopsocus immunis showing parameres, Wendling Beck Project (Norfolk, UK), 26th May 2024
, North Elmham, 13-May-25 (A) (1).jpg)
, North Elmham, 13-May-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 13th May 2025
, North Elmham, 16-May-22 (A) (1).jpg)
male Mesopsocus immunis, North Elmham (Norfolk, UK), 16th May 2022
, North Elmham, 17-May-22 (A) (1).jpg)
male Mesopsocus immunis, North Elmham (Norfolk, UK), 17th May 2022
I got my photos muddled up and as a result I'm not quite sure which of the last two this subgenital plate related to.
, North Elmham, 16 or 17-May-22 (A) (2).jpg)
parameres of one of the same male Mesopsocus immunis, North Elmham (Norfolk, UK), 16th or 17th May 2022
, North Elmham, 18-May-24 (A) (1).jpg)
, North Elmham, 18-May-24 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 18th May 2024
, North Elmham, 19-Jun-23 (A) (1).jpg)
, North Elmham, 19-Jun-23 (A) (2).jpg)
, North Elmham, 19-Jun-23 (A) (3).jpg)
, North Elmham, 19-Jun-23 (A) (4).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 19th June 2023
, North Elmham, 2-Jun-19 (B) (1).jpg)
, North Elmham, 2-Jun-19 (B) (2).jpg)
male Mesopsocus immunis, North Elmham (Norfolk, UK), 2nd June 2019
, North Elmham, 2-Jun-19 (A).jpg)
, North Elmham, 2-Jun-19 (C).jpg)
second and third male Mesopsocus immunis, North Elmham (Norfolk, UK), 2nd June 2019
, North Elmham, 23-May-25 (A) (3).jpg)
, North Elmham, 23-May-25 (A) (1).jpg)
, North Elmham, 23-May-25 (A) (2).jpg)
, North Elmham, 23-May-25 (A) (4).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 23rd May 2025
, North Elmham, 24-May-25 (A) (1).jpg)
, North Elmham, 24-May-25 (A) (2).jpg)
, North Elmham, 24-May-25 (B) (1).jpg)
, North Elmham, 24-May-25 (B) (2).jpg)
, North Elmham, 24-May-25 (C) (1).jpg)
, North Elmham, 24-May-25 (C) (2).jpg)
, North Elmham, 24-May-25 (D) (1).jpg)
, North Elmham, 24-May-25 (D) (2).jpg)
4x male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 24th May 2025
I normally clear the abdomen in potassium hydroxide solution to clear it in order to see the parameres clearly, but sometimes it is possible to make them out sufficiently without clearing it.
, North Elmham, 24-Oct-26 (A) (1).jpg)
, North Elmham, 24-Oct-26 (A) (2).jpg)
, North Elmham, 24-Oct-26 (A) (3).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 24th October 2026
, North Elmham, 25-May-19 (A) (1).jpg)
, North Elmham, 25-May-19 (A) (2).jpg)
, North Elmham, 25-May-19 (A) (3).JPG)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 25th May 2019
, North Elmham, 25-May-25 (A) (1).jpg)
, North Elmham, 25-May-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 25th May 2025
, North Elmham, 27-Jun-25 (A) (1).jpg)
, North Elmham, 27-Jun-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 27th June 2025
, North Elmham, 27-May-25 (A) (1).jpg)
, North Elmham, 27-May-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 27th May 2025
, North Elmham, 28-May-25 (A) (1).jpg)
, North Elmham, 28-May-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 28th May 2025
, North Elmham, 3-Jun-20 (A) (1).jpg)
, North Elmham, 3-Jun-20 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 3rd June 2020
, North Elmham, 5-Jun-25 (A) (1).jpg)
, North Elmham, 5-Jun-25 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 5th June 2025
, North Elmham, 5-May-24 (A) (1).jpg)
, North Elmham, 5-May-24 (A) (2).jpg)
, North Elmham, 5-May-24 (A) (3).jpg)
, North Elmham, 5-May-24 (A) (4).jpg)
, North Elmham, 5-May-24 (A) (5).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 5th May 2024
, North Elmham, 9-Jun-22 (A) (1).jpg)
, North Elmham, 9-Jun-22 (A) (2).jpg)
, North Elmham, 9-Jun-22 (A) (3).jpg)
, North Elmham, 9-Jun-22 (A) (4).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 9th June 2022
, Dillington Carr, 14-May-22.jpg)
male Mesopsocus immunis, Wendling Beck Project (Norfolk, UK), 14th May 2022
, Darlow's Wood, 11-Jun-25 (A) (1).jpg)
, Darlow's Wood, 11-Jun-25 (A) (2).jpg)
, Darlow's Wood, 11-Jun-25 (A) (3).jpg)
male Mesopsocus immunis showing parameres, Wendling Beck Project (Norfolk, UK), 11th June 2025
, North Elmham, 21-May-24 (A) (1).jpg)
, North Elmham, 21-May-24 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 21st May 2024
, North Elmham, 13-May-24 (A) (1).jpg)
, North Elmham, 13-May-24 (A) (2).jpg)
male Mesopsocus immunis showing parameres, North Elmham (Norfolk, UK), 13th May 2024