Diptera.info

Posted by Ralph Sipple on 13-07-2008 13:56

Hello forum,

this tachinid I found sitting on reed-grass in a moist grey-dune-habitat. Keywork led me to Triarthria sp. though I wasn`t sure with humeral-bristles.
Could this be correct?

Location: Darss-peninsula, Baltic Sea, Germany
Date: 25.06.2008
Length: 5,1mm

Regards
Ralph

P.S: @Andre: This time I used the Camera directly without the binocular. In case of bigger-sized objects, this could be the better way.

Edited by Ralph Sipple on 15-07-2008 05:00

Posted by ChrisR on 14-07-2008 00:28

The size is about right - but I'd need to see the face very clearly to check the parafacial for a line of bristles :) What was the problem with the humeral bristles?

Posted by Ralph Sipple on 14-07-2008 18:51

Hello Chris,

In Tschorsnig & Herting`s tachinid-key you have to decide:

- two humeral bristles (or three in a straight line) >>> Triarthria (and others)
or
- four humeral bristles, the strongest of them form a triangle >>> Pseudopachystylum, Zophomyia

In this case I (believe to) see the triangle (1,2,3) but all other characteristics lead me to Triarthria.

Posted by ChrisR on 14-07-2008 22:01

The face looks quite like Triarthria (with all those bristles) so I think you are on the right track. Your 3rd "humeral bristle" is actually one of the notopleurals - I think you can just see the 3rd humeral bristle in a line with the 1st and 2nd :)

Posted by Ralph Sipple on 15-07-2008 04:58

Many thanks, Chris. Then it could be T. setipennis, the only species of this genus in Germany.