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Size 3 mm. Nikita have examined the specimen and found it interesting, so I'm posting it.

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Colobaea distincta, female.

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Thanks a lot Nikita.

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This fly is really interesting for two reasons:
1. Colobaea distincta is not a common species, at least in Russia.
2. This very specimen has one strong seta on posterior margin of mesopleuron, both on left and right side
Has anyboby ever seen Colobaea with such a seta?
Nikita