Diptera.info

Posted by clovis on 01-06-2014 00:37

Hi,

I would have thought i'd find the specie easily, with this long and crenelated segment one of antenna, but no...
So obviously it's italica group, but after that my hesitation is between pallens witch has crenelated segment, but some white at the back of wing i can't see, and longeantennata witch has antennal segment 3 black...

A little help?
Specimen passed some time in alcohol.

www.galerie-insecte.org/galerie/image/dos120/big/img_3797.jpg.jpg

Clovis : Bulgarie : Rozhen : 2820 : 9/8/2013
Altitude : 581 m - Taille : 10mm
Réf. : 120814

www.galerie-insecte.org/galerie/image/dos120/big/img_3853.jpg.jpg

Clovis : Bulgarie : Rozhen : 2820 : 9/8/2013
Altitude : 581 m - Taille : 10mm
Réf. : 120810

www.galerie-insecte.org/galerie/image/dos120/big/img_3803.jpg.jpg

Clovis : Bulgarie : Rozhen : 2820 : 9/8/2013
Altitude : 581 m - Taille : 10mm
Réf. : 120812

Posted by Zeegers on 01-06-2014 11:14

Hi Clovis

Very interesting ! Definitely NOT pallens, it is either italica or longeantennnata. The difference is in the width vs. height ratio (broad in longeantennata, naroow in italica). The colouration of antenna tends to be variable, though it is black indeed in all my longeantennata (n = 3).
So have a look / take in picture in frontal view and compare with italica

Theo

Posted by clovis on 01-06-2014 16:05

Here is the picture:

nsa33.casimages.com/img/2014/06/01/140601050931385250.jpg

It is larger than the unique specimen i have i believe to be italica. But this need a confirmation, i tend to get the specie wrong with this genus.

Posted by Zeegers on 01-06-2014 17:14

You are using a different angle than that I'm used to, but clearly border than italica.
Could we get a more frontal pic, so from lower perspective ?

theo

Posted by Zeegers on 01-06-2014 20:40

The femora are clearly yellowish on parts, which should not be so in longeantennata and should be so in italica. So I'm afraid it is italica after all.

Theo

Posted by clovis on 02-06-2014 10:41

Ah!! So bad!!! Well, i'll have two specimen to compare with now...
Antennal segment 1 is really longer than on the the other specimen, is it intraspecific variation or this specimen is aberrant?

nsa33.casimages.com/img/2014/06/02/140602114823509801.jpg

Posted by Zeegers on 02-06-2014 11:55

Hi Clovis

Thanks for the picture. I'm not saying what it is, I am really in doubt. Some features are italica, some are longeantennata. Maybe the colour issues are due to the alkohol ? First antennal segment clearly indicates longeantennata, as you correctly noticed.
So, I'm not giving it a final call.

Theo

Posted by Zeegers on 02-06-2014 11:56

Or could it be grandis ?? And that for some reason we don't see the spots on tergites 2-3. That would make sense !

Theo

Posted by clovis on 02-06-2014 18:45

I don't know, i can't see any spot on T2-3 (not before T5), but i was wondering if it could be du to alcohol.
What do you think i should look on for more argument?

I have another specimen from the same horse witch correspond exactly to this one except it hasn't 2-3 constriction on the first antennal segment. (only one constriction. Same length for the first antennal segment). I think it's the same specie, so if you wonder something about the variation, i can check on that one. (but no spot before T5 either)

Edited by clovis on 03-06-2014 13:18