Thread subject: Diptera.info :: Mysterious critter
Posted by pierred on 11-05-2025 07:20
#1
Hello,
{Click on the picture to get a better resolution. Click again to come back.}
Pierre Duhem : France : Saint-Sornin : 17600 : 25/04/2025
Altitude : 23 m - Taille : 3-4 mm
Réf. : 358541
The black halters make it a Diptera. The picture is on a very young oak leaf (Quercus pubescens) where I saw galls of
Macrodiplosis roboris and
M. pustularis but I never saw Cecidomyiidae antennas of this form.
Does somebody have an idea?
Thanks you in advance.
Posted by Tony Irwin on 11-05-2025 09:19
#2
The form of the antennal segments and the colour of the haltere suggest to me that this is Sciaridae, but I would need a clearer picture to be certain.
Posted by pierred on 11-05-2025 09:45
#3
Tony,
Thanks for your proposition. I don't have a better picture, sadly.
Posted by John Carr on 11-05-2025 12:49
#4
The wing belongs to Sciaridae.
Posted by Tony Irwin on 11-05-2025 20:45
#5
John - I do worry about those Lestremiinae which have a very sciarid-like venation.
Posted by John Carr on 12-05-2025 12:24
#6
The forks of Cu are separate nearly to the base of the wing and the costa is strong about 2/3 of the distance from R4+5 to M.
Posted by Jan Maca on 12-05-2025 15:30
#7
No spurs are visible on the tibiae, thus I am rather for Cec.. Lestremiinae.
Posted by Tony Irwin on 12-05-2025 18:01
#8
Thanks for those pointers, John. The costal extension in Sciaridae is something I've overlooked.
Jan - I think the spurs in this case are simply small, ventral and not visible.