Thread subject: Diptera.info :: Chaoboridae, Mochlonyx ???

Posted by Jozef Obona on 29-09-2015 13:44
#1
Hi all,
please can it be Mochlonyx fuliginosus ?
Thx for help :)
Jozef

Posted by Jozef Obona on 29-09-2015 13:44
#2
wing

Posted by Jozef Obona on 29-09-2015 13:45
#3
.
Edited by Jozef Obona on 29-09-2015 13:49

Posted by John Carr on 29-09-2015 14:14
#4
In the key to American Chaoboridae:

First tarsomere shorter than second. Halter with numerous setae on stem and knob. Gonostylus with spiniform seta at apex. ... Mochlonyx

First tarsomere longer than second. Halter with two groups of two to five setae on knob. Gonostylus without apical spiniform seta at apex. ... Chaoborus

Posted by Jozef Obona on 30-09-2015 07:41
#5
Thanks for info John
I thing it is Mochlonyx :)

Posted by Jozef Obona on 30-09-2015 07:42
#6
and if I used :
Saether O.A. 1997b: Diptera Chaoboridae, phantom midges, In Nilsson A. (ed.): Aquatic Insects of North Europe. Vol. 2. Apollo Books, Stenstrup, pp. 149-161.

probably M. fuliginosus ?

Posted by Tony Irwin on 30-09-2015 10:10
#7
The photo of the leg shows tarsomeres 5, 4, 3 and part of 2. Looking at your first image, I'd say the first tarsomere (next to the tibia) was longer than the second, so this should be Chaoborus. The safest way to identify it is to look at the shape of the penis valve (situated internally at the base of the gonocoxite).

Posted by Jozef Obona on 30-09-2015 11:42
#8
Tony Irwin wrote:


Thanks for help Tony...
so Chaoborus :)
and my big mistake with wrong tarsomeres :o

Posted by Gunnar M Kvifte on 04-10-2015 12:08
#9
Chaoborus is correct, probably crystallinus or flavicans. The easiest way to separate them in my opinion is treating the male terminalia in KOH and compare the penis valves with Sæther's figures.