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I had a few like this in the last month and I couldnt decide between flavicornis and rhombicus, indeed I may have had both. Flavicornis I had recorded before didnt have the dark speckling of the ones I got recently. Neither had they the pale rhomboid- some of mine I think were definitely rhombicus but I didnt get round to posting.
I think there is a chance this is rhombicus based on the pale central rhomboid marking?
Hi Cathal, thanks for your reply. I'm pretty sure it's not rhombicus as it has a group of short black spines on the top of the last abdominal segment. Also the reason I went for flavicornis, also the superior appendage of flavicornis looks blunter (more pointed in rhombicus) in the key figure. However, this may all be rubbish.
To be honest Brian I have just been using appearances, size and to a lesser extent wing venation in my dabbling with caddis flies. Therefore my knowledge of them falls quite a bit below thoroughly scientific. I have seen a few flavicornis which were unmistakable in that the were transparent and greasy looking. This one just seems a bit too well marked for flavicornis and after looking at it in the book, probably even too well marked for rhombicus which I had previously suggested.
My only thought now is that this may be something like a fairly aged marmoratus (for example) but I think Ive probably said enough for now. I'll let you check the genitalia as I have zero experience of looking at this detail yet (despite having the book for up to a year!).
Thanks for all the effort Cathal. May be when I look at some of the others it will become clearer. I'll get back to you in due course.
Lat/Lng: 56.0683, -3.2514
OS grid ref: NT221868