Posted by Oryctes on 11-05-2025 09:35
#1
Oryctes : France : Villeneuve-d'Ascq : 59650 : 09/05/2025
Altitude : 44 m - Taille : estimation : 7 mm
Réf. : 358539
Hello,
I found this Chaoboridae in Villeneuve d'Ascq (Nord, France) near a large pond. It was on May 9, 2025.
The fringed appearance of the wingtips and the little genitalia that can be seen may suggest the species
Chaoborus obscuripes.
What is your opinion on this ?
Thank you in advance,
Dominique
Posted by Oryctes on 18-05-2025 08:57
#2
Do you have any ideas about this Chaoboridae ? Thank you a lot.
Dominique
Posted by Tony Irwin on 18-05-2025 09:31
#3
If you have a male specimen (like the one you photographed), then I would advise carefully dissecting out the penis valve (hidden within the hypopygium at the base of the gonocoxites). This should provide a clear indication of the species. See below for link to paper with good illustrations. http://www.entomologi.no/journals/nje/2021-1/pdf/nje-vol68-no1-2021-67-127.pdf
Posted by Oryctes on 18-05-2025 18:54
#4
Thank you very much Tony for your reply. I didn't catch the insect so ultimately it will not be possible to define its species.
Thank you for the advice, the anatomical details and the link to this paper which is indeed very well written and illustrated.
Dominique