Diptera.info

Posted by kurt on 27-07-2009 20:23

I think this fly is a Norwickia and had marklini last year in same place.
This one looks a bit different from that. Could species be told from this pictures?
Same fly on both pictures.

Photo from Nattsj�n, �ngermanland, Sweden 62.56N 17.36 E 26 july 2009

Thanks for your help in advance

Regards

Kurt Holmqvist

Edited by kurt on 27-07-2009 20:25

Posted by kurt on 27-07-2009 22:27

Thanks for your answer Theo.

I have some more photos of another speciemen from same lokation and day, but abdomen looking quite different.
I will post a new thread later.
What needs to see on fotos to sort out alpina?

Posted by ChrisR on 28-07-2009 11:09

I know it's not a keyable feature but N.marklini (and possibly alpina?) appears to be much blacker than other European species - I have never seen them close-up but I examined a good series of marklini in Moscow this year. :)

Posted by Jaakko on 07-08-2009 13:13

Hi,

Using the T&H it is not possible to reliably identify the Scandinavian specimens of marklini and alpina. All the alpina I have seen have been on treeless mountaintops ja marklini in lowlands. Typically marklini is much bigger, but this in parasitoids is not a good feature as you know. Some differences:

N. alpina
Hairs behind the head cream-white
Face with greyish-white pollination, fronto-orbital region almost black
Males: preandrial sternite "blunt arrow" -shaped

N. marklini
Overall more orange appearance: hairs behind the head orange, also calypters, basicosta and facial pollination rather orange. Basicosta can be black in some specimens! Fronto-orbital region with unpollinated small dots. Preandrial sternite different.

Probably bigger differences in the male genitalia, but I haven't checked them... By comparison these two species are easy to differentiate.

The fly in the photos looks like a marklini, also the habitat makes this likelier.

Jaakko

Edited by Jaakko on 07-08-2009 13:17