Diptera.info :: Identification queries :: Diptera (adults)
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 Stevenia deceptoria ♀ to confirm--> Ok
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| rafael_carbonell |
Posted on 17-12-2024 01:48
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 Member Location: Beuda, Girona, Catalonia Posts: 682 Joined: 23.03.06 |
The 7,8 mm ♀ fly was found indoors (Spain: Girona: Beuda, 16.vii.2021). In Spain only two species are recorded, S.deceptoria and S.umbratica. This one looks quite similar to S.deceptoria: - Vein R4+5 with setae only at base. - Postpronotum with three setae arranged in a triangle (left humerus) or only two (right humerus) - Parafacial with strong setae in lower half. - Abdomen with no discal setae, but marginal setae: syntergite 1+2 with 2 median marginal setae, T3 with 2 median marginal setae, T4 with a row of marginal setae. - Greyish dusting on syntergite 1&2 as well in T3 and T4 - Ratio of length pedicel/first flagellomere =11/15 - Orange ring at the end of antennal segment 2; palps also orange - Tips of the femora reddish. Was not observed: - Abdominal tergites black with a clear posterior yellowish margin.(that was very narrow) rafael_carbonell attached the following image:  [298.91Kb] Edited by rafael_carbonell on 18-12-2024 08:14 |
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| rafael_carbonell |
Posted on 17-12-2024 01:56
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Member Location: Beuda, Girona, Catalonia Posts: 682 Joined: 23.03.06 |
And below drawing the position of setae
rafael_carbonell attached the following image:  [283.98Kb] |
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| rafael_carbonell |
Posted on 17-12-2024 01:57
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Member Location: Beuda, Girona, Catalonia Posts: 682 Joined: 23.03.06 |
More photos and information: https://www.inaturalist.org/observations/255341793 |
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| Zeegers |
Posted on 17-12-2024 12:07
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Member Location: Soest, NL Posts: 18948 Joined: 21.07.04 |
Yes, looks good, despite the absence of discals. Theo |
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| rafael_carbonell |
Posted on 17-12-2024 12:41
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Member Location: Beuda, Girona, Catalonia Posts: 682 Joined: 23.03.06 |
I see, there are also discals on Steven Falk's specimen (https://www.flic...9710183659). In my specimen they could have fell. Curiously, having or not discals is not important in the Stevenia key (Cerretti & Pape, 2007)
Edited by rafael_carbonell on 17-12-2024 19:40 |
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| Zeegers |
Posted on 17-12-2024 22:19
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Member Location: Soest, NL Posts: 18948 Joined: 21.07.04 |
No, it is unstable in deceptoria, but when present, it directly excludes umbratica. Theo |
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