Posted by Walther Gritsch on 16-07-2022 21:15
#1
Hello,
Judging by external characters the fly in question should be Sapromyzosoma quadricincta, but the genitalia don't fit. At least I can't make them fit the drawing in Shatalkin. There's a kind of resemblance though ...
It has a pair of black spots on T6 and three preapicals on t2 (one dorsal and two ventrals) and only one of the ocellar bristles is located inside the ocellar triangle, curiously enough.
If it isn't quadricincta then what are the options?
Caught in a light-trap, Denmark, May 2022.
All the best,
Edited by Walther Gritsch on 22-07-2022 12:24
Posted by Paul Beuk on 22-07-2022 09:57
#2
Most species show considerable variation within the basic structure of their genitalia. This is
quadricincta but the direction of the spines on the inner side of the left lobe may vary, the thickness of the inner side of the right lobe may vary and there is some variation in the relative legnths of the inner and outer side of the lobe.
Posted by Walther Gritsch on 22-07-2022 12:23
#3
Thanks, Paul!
I didn't consider variation a possibility.
Edited by Walther Gritsch on 22-07-2022 12:24