Diptera.info

Posted by Morten A Mjelde on 26-10-2019 11:38

South Norway, Telemark,
04.06.2019,
Size: 7,2 mm.
Resting on a house wall - garden.

Edited by Morten A Mjelde on 01-11-2019 23:22

Posted by Zeegers on 27-10-2019 09:17

The palpus is bright yellow, combined with black scutellum, that should be a big clue.
I am thinking Paratryphera.
If you still have the fly, check
* if the calypter is ‘balloonish’ in a funny way at anterior margin
* if the barette is hairy.

Theo

Posted by Morten A Mjelde on 27-10-2019 18:53

Thank you!
The palpus looks blackish to me.
I struggle a bit to point out the berette on the fly...

Rosevinge

Posted by Zeegers on 28-10-2019 09:21

#10

Yes, palpus is black, which is also possible in Paratryphera.
I see some hairs ipon the barette and I can’t make out the calypter shape.
Uncertain.

Theo

Posted by Morten A Mjelde on 28-10-2019 21:06

#11

Ok - I've looked at calyptra in a microscope today and yes - "the calypter is 'balloonish' in a funny way at anterior margin."

Rosevinge

Posted by Zeegers on 30-10-2019 08:37

#12

If you could also confirm that the second (apparent first) segment is slightly elongated (at least twice as long as broad), I am pretty confident we can call this Paratryphera barbatula.

Theo

Posted by Morten A Mjelde on 30-10-2019 22:18

#13

Hmm - Did you mean second antenna segment or second tergite or ...? (Sorry - you are dealing with an amateur)

Rosevinge

Posted by Zeegers on 31-10-2019 08:05

#14

O sorry ! Second ARISTAL segment.

So not the antenna ! If you have a very close look, you can see that the ‘arista’ in most Tachinidae is actually the third segment of the arista. There are two basal segments. The first one is nearly always extremely short and difficult to see,
athe second one might be slightly elongated, in the sense that it is longer than wide.

Theo

Edited by Zeegers on 31-10-2019 08:06

Posted by Morten A Mjelde on 01-11-2019 00:07

#15

Yes - the second segment looks elongated - but it is
slightly difficult to distinguish the first segment from the second by microscope or pictures.

Rosevinge

Posted by Zeegers on 01-11-2019 08:03

#17

Yes ! This is totally OK.

For now, very likely Paratryphera barbatula, which is not as rare with you as it is with us.

The balloonish calypter is very difficult to illustrate, this it is fundamentally three dimensional.

Theo

Posted by Morten A Mjelde on 01-11-2019 23:20

#18

Thanks a lot! :)
I have tried to photograph the shape of the calypter, but the camera has only two dimensions. Easier to see the balloon shape in my binocular microscope.

Rosevinge

Posted by Zeegers on 02-11-2019 09:09

#19

Thanks, but I think it can only be seen laterally from above.
We are talking about the anterior margin on the calypter.

Theo