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Diptera.info :: Identification queries :: Diptera (adults)
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Hydrotaea meridionalis?
Widus
#1 Print Post
Posted on 07-09-2020 17:27
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Hi,
Could this be the species mentioned in the title of the subject?
www.galerie-insecte.org/galerie/image/dos259/big/Hydrotaea%20meridionalis%20001%20-%202020.06.07%20Grangette%205D%20Lausanne%20Vaud%20Suisse.jpg
Christian Widmann : Suisse : Lausanne : 1010 : 07/06/2020
Altitude : 632 m - Taille : 7.7 mm (corps)
Réf. : 259924
Click on the image to enlarge it.
 
Nikita Vikhrev
#2 Print Post
Posted on 09-09-2020 16:52
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With this mosaic of tiny images I can only say:
Muscidae
not Hydrotaea
Please, large dorsal and lateral views, one by one
Nikita Vikhrev - Zool Museum of Moscow University
 
Widus
#3 Print Post
Posted on 15-09-2020 17:26
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Dear Nikita,
Thank you for taking a look at those images. If you click on the composite image, it should get much bigger and details can hopefully be seen better.
Anyways, I will upload more images as requested.
Regards,
Christian
 
Nikita Vikhrev
#4 Print Post
Posted on 15-09-2020 20:25
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I tried to click, no result.
I can see that radial node setulose. Is it ventral side only or both sides?
Nikita Vikhrev - Zool Museum of Moscow University
 
Widus
#5 Print Post
Posted on 15-09-2020 21:01
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Radial node setulose on both sides
Try this link for larger images.
Also two additional images added.
Widus attached the following image:


[244.54Kb]
Edited by Widus on 15-09-2020 21:41
 
Widus
#6 Print Post
Posted on 15-09-2020 21:39
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Side view
Widus attached the following image:


[274.43Kb]
 
Nikita Vikhrev
#7 Print Post
Posted on 16-09-2020 11:16
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"Radial node setulose on both sides"
Thus, Mydaea and you have the following choise
Nikita Vikhrev attached the following image:


[213.17Kb]
Nikita Vikhrev - Zool Museum of Moscow University
 
Widus
#8 Print Post
Posted on 19-09-2020 16:34
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Arista plumose, longest aristal hairs about width of flagellomere

-> not Mydaea anicula
-> not Mydaea obscurella
Widus attached the following image:


[212.67Kb]
Edited by Widus on 19-09-2020 16:58
 
Widus
#9 Print Post
Posted on 19-09-2020 16:50
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Prealar < posterior notopleural
Fore femur without posterior seta

-> not Mydaea nebulosa
Widus attached the following image:


[176.4Kb]
Edited by Widus on 19-09-2020 16:55
 
Widus
#10 Print Post
Posted on 19-09-2020 17:07
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I can also discard Mydaea nubila which is shorter than 7.7 mm and which also has darkened halteres

So it seems it is Mydaea ancilla. The mediotergite indeed appears shiny black and not pruinose (although I could not take a convincing pictures of this structure on my specimen as the wings were hiding it). Supporting criteria include:
- scutum with 4 very dark stripes
- posterior crossvein oblique
- prealar seta about 3/4 of posterior notopleural, although here pra is 85-91% of post nt (based on two measurements from different images)
- katepisternals 1 + 2
- fore tibia without posterior seta
- hind tibia with 2-3 anterodorsals and 2-3 anteroventrals
Widus attached the following image:


[16.24Kb]
Edited by Widus on 20-09-2020 12:53
 
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