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Diptera.info :: Identification queries :: Diptera (adults)
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Stevenia deceptoria ♀ to confirm--> Ok
rafael_carbonell
#1 Print Post
Posted on 17-12-2024 01:48
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Location: Beuda, Girona, Catalonia
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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
 
rafael_carbonell
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Posted on 17-12-2024 01:56
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And below drawing the position of setae
rafael_carbonell attached the following image:


[283.98Kb]
 
rafael_carbonell
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Posted on 17-12-2024 01:57
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More photos and information: https://www.inaturalist.org/observations/255341793
 
Zeegers
#4 Print Post
Posted on 17-12-2024 12:07
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Yes, looks good, despite the absence of discals.

Theo
 
rafael_carbonell
#5 Print Post
Posted on 17-12-2024 12:41
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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
 
Zeegers
#6 Print Post
Posted on 17-12-2024 22:19
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No, it is unstable in deceptoria, but when present, it directly excludes umbratica.

Theo
 
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