Thread subject: Diptera.info :: Which Tachinidae? => Thelaira cf. nigripes
Posted by Karsten Thomsen on 25-11-2021 15:27
At edge of broadleaf forest, Tyskermose, Assens, Funen, Denmark, 25. juni 2021.
Edited by Karsten Thomsen on 26-11-2021 19:55
Posted by Karsten Thomsen on 25-11-2021 15:28
Unfortunately, no better head shots.
Posted by eklans on 25-11-2021 18:36
Hi Karsten, a male Thelaira solivaga, I think.
Posted by Zeegers on 26-11-2021 09:29
Thelaira it is, but why solivaga ?
I don’t see an other vertical and I don’t see many strong ad on mid tibia.
Posted by eklans on 26-11-2021 10:13
I used the T&H key
Males solivaga: "...light side spots of the abdomen extended, clearly visible from above."
"dorsal hairs of tergites 3 and 4 fine, as long as 1/7 - 1/5 of the marginal bristles"
Males nigripes: "...abdomen usually appears dark when seen from above."
"middle dorsal hairs of tergites 3 and 4 as long as 1/4 - 2/5 of the marginal bristles"
The other characters are not clearly visible but may be present, I thought.
Posted by Lucyna on 26-11-2021 11:42
Thelaira sp. (For example Thelaira nigripes: 2 anterodorsal setae bristles, Thelaira solivaga: 3-4 anterodorsal setae bristles on the middle tibia - They are twin species)
Edited by Lucyna on 26-11-2021 11:43
Posted by Karsten Thomsen on 26-11-2021 13:51
In Denmark, all Thelaira have so far been attributed to nigripes. if this one belongs to T. solivaga, it would be the first record nationally.
Posted by Lucyna on 26-11-2021 14:49
Carefully ;) . You need to be sure how many bristles there are on the middle tibia.
Posted by Zeegers on 26-11-2021 19:20
You should not only look for what you see, but also for ehat you don’t see (see my previous post). And I don’t think tha central dorsal hairs on tergites can be evaluated from these pics, yes the laterals can be done, but that is not what T&H are saying.
To me, this is either Thelaira spec or even cf. nigripes and the distribution seems to agree.