Thread subject: :: Syrphidae: Portevinia maculata ? --> No, it's Cheilosia semifasciata

Posted by kuv on 06-12-2019 14:45

Northern Germany, Schleswig-Holstein, Schenefeld near Hamburg, hedge with a drainage ditch between a playground and a field of a nursery school for trees, grown up with bushes like Corylus, Acer campestre, Salix and other, at a leaf of Prunus padus, 30th of April 2019, Outdoorphotos: kuv. Is my idea ok? Please help me to get the ID.

Edited by kuv on 07-03-2020 14:38

Posted by kuv on 06-12-2019 14:46

2nd picture:

Posted by Xylosoma on 07-12-2019 10:16

No, this is not Portevinia maculata, there are too many hairs on eyes.

Posted by kuv on 08-12-2019 12:04

Thank you very much Xylo,
so it remains "Cheilosia sp." ?
Greetings Kuv

Posted by Karsten Thomsen on 06-03-2020 19:47

Judging from Bot & Meutter 2019, the combination of dark antennae, hairy eyes, and clear, welldefined grey-blue spots on the tergits should point to Cheilosia fasciata. C. semifasciata has less clear spots and is quite small.
I have myself never seen any of the two mentioned Cheilosia, however.

Posted by Ectemnius on 06-03-2020 22:26

Hello people,

Portevinia has red antennae. Cheilosia fasciata has dark hairs on the eyes and quite extensive red around the knees. The dark legs, light hair on the eyes, weak spots on the abdomen and habitat all point to Cheilosia semifasciata. Also the quite downward protruding face, although poorly visible from this angle, is an indication
The larvae mine the leaves of Sedum sp., a common garden plant.
This is also from experience as I have seen all the aforementioned species multiple times in the field...

Kind regards,


Posted by kuv on 07-03-2020 14:37

Woow, thank you very much Thomas :) and Ectemnius :).
So I think I can change headline to Cheilosia semifasciata!
Best regards Kuv

Posted by Karsten Thomsen on 07-03-2020 15:08

Congrats, kuv - I trust that we will find this species in Denmark one day, too, since both the British and the Norwegians have it, too. :-)

Posted by kuv on 08-03-2020 11:27

Thanks Thomas and good luck to find this fly in Denmark.
Greetings Kuv

Posted by Ectemnius on 08-03-2020 14:08

Wow, it's not listed as Danish in faunaeuropea indeed! If you want to find it, don't look in the vicinity of Sedum sp. In the Netherlands it has been found at least several kilometers away from the nearest Sedum plant.
The place and time to look for it is in April and May along paths in forests. There you find males, sometimes in a group, defending a territory on some leaves. Mostly found in parks and small woods in the vicinity of urban areas.

Kind regards,


Posted by Karsten Thomsen on 19-03-2020 23:52

Thank you for the useful tips, Ectemnius! :-)