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Diptera.info :: Identification queries :: Diptera (adults)
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Thailand Muscidae ID -> Hydrotaea chalcogaster
smol
#1 Print Post
Posted on 09-09-2024 08:21
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23 Jul 2024, Thailand (Koh Samui)

Observation: https://observation.org/observation/327574968/

observation.org/media/photo/104186755.jpg
observation.org/media/photo/104186756.jpg
observation.org/media/photo/104186757.jpg
observation.org/media/photo/104186758.jpg
Edited by smol on 09-09-2024 21:48
 
John Carr
#2 Print Post
Posted on 09-09-2024 10:46
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Muscidae. Hydrotaea capensis?
 
http://www.flickr.com/photos/31715949@N00
smol
#3 Print Post
Posted on 09-09-2024 11:29
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John Carr wrote:
Muscidae. Hydrotaea capensis?


Thank you very much!
 
Nikita Vikhrev
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Posted on 09-09-2024 14:17
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John, I agree that it is Hydrotaea (Ophyra). But I don't think it is capensis. It seems to me that eyes are not emarginated on hind margin. Most probable H. chalcogaster.
Nikita Vikhrev attached the following image:


[77.62Kb]
Nikita Vikhrev - Zool Museum of Moscow University
 
John Carr
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Posted on 09-09-2024 14:27
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Nikita Vikhrev wrote:
John, I agree that it is Hydrotaea (Ophyra). But I don't think it is capensis. It seems to me that eyes are not emarginated on hind margin. Most probable H. chalcogaster.


Is there a modern review of this group? I checked Sabrosky (1949). He says the male of O. chalcogaster has partially yellow fore tarsi and the female has partially yellow arista.
 
http://www.flickr.com/photos/31715949@N00
Nikita Vikhrev
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Posted on 09-09-2024 16:14
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I use Fauna of India, Emden 1965.
Yes, absence of emargination against invisible orange on arista.
1. I suppose emargination more reliable.
2. In female yellowish arista is not easy visible, especially on photo.
3. I personally spent a lot of time in Thailand. H. capensis isn't reported for Thailand. Especially on southern Koh Samui. In S thailand only H. spinigera and H. chalcogaster are present.
Nikita Vikhrev - Zool Museum of Moscow University
 
smol
#7 Print Post
Posted on 09-09-2024 19:37
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Thank you very much John and Nikita! For what it is worth, a zoomed in picture of the head based on the raw file:
observation.org/media/photo/104235366.jpg
observation.org/media/photo/104235707.jpg

Interestingly enough, I can see the yellowish arista basally and only dorsally. I have checked multiple dorsal pictures, and they all show this basal yellowish (towards orange) color. Though, the sun reflection still makes it very hard.
 
Nikita Vikhrev
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Posted on 09-09-2024 20:58
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Well, as you know I'm expert. My decision is H. (chalcogaster with very small "?"Wink
Nikita Vikhrev - Zool Museum of Moscow University
 
smol
#9 Print Post
Posted on 09-09-2024 21:48
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Nikita Vikhrev wrote:
Well, as you know I'm expert. My decision is H. (chalcogaster with very small "?"Wink


Much appreciated! Very happy with this name Smile
Edited by smol on 09-09-2024 21:49
 
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