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23 Jul 2024, Thailand (Koh Samui)

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

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Muscidae. Hydrotaea capensis?

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Thank you very much!

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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.

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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.

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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.

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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:



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.

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Well, as you know I'm expert. My decision is H. (chalcogaster with very small "?")

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Much appreciated! Very happy with this name :)