Diptera.info :: Identification queries :: Diptera (adults)
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 Xylodiplosis ?
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| Simon Thevenin |
Posted on 08-12-2020 18:06
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Member Location: Rognes Posts: 16 Joined: 03.07.20 |
Hello, I found hundreds of those flies while cutting oaks in South of France (13). Those Cecidomyiids were only 2-4 mm long, ovipositing at oak. Is this Xylodiplosis ? Here is a video link of the oviposition : https://www.youtube.com/watch?v=NHz6rGdXSZk Simon Thevenin attached the following image:  [293.54Kb] Edited by Simon Thevenin on 08-12-2020 18:09 |
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| Simon Thevenin |
Posted on 08-12-2020 18:12
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Member Location: Rognes Posts: 16 Joined: 03.07.20 |
It was a few days ago
Simon Thevenin attached the following image:  [272.99Kb] |
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| John Carr |
Posted on 09-12-2020 13:27
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 Super Administrator Location: Colorado, USA Posts: 10655 Joined: 22.10.10 |
Supertribe Cecidomyiidi, I don't know genus. |
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| Simon Thevenin |
Posted on 09-12-2020 17:34
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Member Location: Rognes Posts: 16 Joined: 03.07.20 |
I also have top photos with the wing venation, if needed |
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| John Carr |
Posted on 09-12-2020 19:28
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Super Administrator Location: Colorado, USA Posts: 10655 Joined: 22.10.10 |
Simon Thevenin wrote: I also have top photos with the wing venation, if needed I wouldn't be able to identify with confidence. Gagné's (2018) key to North American Cecidomyiinae mentions fresh-cut logs as habitat for only two genera: Xylodiplosis and Trogodiplosis. To separate them using the key requires a good look at male genitalia or female mouthparts. Here is Gagné's (1985) generic diagnosis for Xylodiplosis: "Eyes very extensive, about 15 facets long at vertex. Postvertical peak long, narrow. Male flagellomeres regular, binodal, tricircumfilar. Female flagellomeres cylindrical, regular. Wing with long, curved R5. Tarsal claws simple, bent near basal third. Male genitalia: cerci convex, short; hypoproct concave posteriorly; aedeagus short, pointed, and gonocoxites unlobed. Ovipositor long, protrusible. the cerci short, ovoid, separate." ...and for Trogodiplosis: "Eyes very extensive, about 17 facets long at vertex. Postocciput very narrow, terminating in long dorsal peak with 2 long setae. Male antennal flagellomeres binodal, tricircumfilar. Mouthparts sexually dimorphic, in male unmodified from usual plan of supertribe, in female larger, more inflated than in male, the hypopharynx lined laterally with large, wide teeth instead of more usual, long setulae. Palpus 4-segmented. Thorax: Wing with long, curved R5, weak M3+4, without evident Rs. Legs long. Tarsal claws robust, bent near basal third, untoothed." |
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| John Carr |
Posted on 09-12-2020 19:29
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Super Administrator Location: Colorado, USA Posts: 10655 Joined: 22.10.10 |
According to the catalog, Trogodiplosis is not known from Europe (only Russian Far East and North America), so based on habitat Xylodiplosis is very likely. |
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| Simon Thevenin |
Posted on 10-12-2020 16:57
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Member Location: Rognes Posts: 16 Joined: 03.07.20 |
There are two species of Xylodiplosis in France, X. nigritarsis and X. aestivalis. Can we eliminate one of the two, given the date? |
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| Simon Thevenin |
Posted on 17-12-2020 21:18
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Member Location: Rognes Posts: 16 Joined: 03.07.20 |
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