Diptera.info :: Identification queries :: Diptera (adults)
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 Mysterious critter
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| pierred |
Posted on 11-05-2025 07:20
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 Member Location: Paris (France) Posts: 1448 Joined: 21.04.05 |
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. Pierre Duhem |
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| Tony Irwin |
Posted on 11-05-2025 09:19
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 Member Location: Norwich, England Posts: 7285 Joined: 19.11.04 |
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.
Tony ---------- Tony Irwin |
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| pierred |
Posted on 11-05-2025 09:45
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Member Location: Paris (France) Posts: 1448 Joined: 21.04.05 |
Tony, Thanks for your proposition. I don't have a better picture, sadly. Pierre Duhem |
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| John Carr |
Posted on 11-05-2025 12:49
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 Super Administrator Location: Massachusetts, USA Posts: 10398 Joined: 22.10.10 |
The wing belongs to Sciaridae. |
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| Tony Irwin |
Posted on 11-05-2025 20:45
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Member Location: Norwich, England Posts: 7285 Joined: 19.11.04 |
John - I do worry about those Lestremiinae which have a very sciarid-like venation.
Tony ---------- Tony Irwin |
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| John Carr |
Posted on 12-05-2025 12:24
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Super Administrator Location: Massachusetts, USA Posts: 10398 Joined: 22.10.10 |
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. |
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| Jan Maca |
Posted on 12-05-2025 15:30
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Member Location: Posts: 1250 Joined: 25.03.10 |
No spurs are visible on the tibiae, thus I am rather for Cec.. Lestremiinae. |
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| Tony Irwin |
Posted on 12-05-2025 18:01
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Member Location: Norwich, England Posts: 7285 Joined: 19.11.04 |
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. Tony ---------- Tony Irwin |
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