Diptera.info :: Identification queries :: Diptera (adults)
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 Identification of female Tanyptera
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| John Bratton |
Posted on 20-02-2019 12:13
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Member Location: Menai Bridge, North Wales, UK Posts: 654 Joined: 17.10.06 |
Hello. Can someone clarify how you separate female Tanyptera atrata and nigricornis, please? In the draft British key, it says that atrata has the trochanters orange and females have tergites 1-3 mainly red; while nigricornis has the trochanters black and female tergites 1-2 mainly red. But in most photos of nigricornis, it has more red than atrata. For example, compare Diptera.info - Photo Albums: Tanyptera atrata (female) (1) with Diptera.info - Photo Albums: Tanyptera nigricornis (female) (1) And what about Diptera.info - Photo Albums: Tanyptera atrata (female) (3) It has much red on the abdomen, but black trochanters. Best wishes John Bratton |
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| Zeegers |
Posted on 20-02-2019 14:01
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Member Location: Soest, NL Posts: 19004 Joined: 21.07.04 |
Dear John Both spcies are extremely variable, but the colouration of the trochanters is decisive. There was a time I could not believe it myself either... Theo |
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| John Bratton |
Posted on 21-02-2019 15:14
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Member Location: Menai Bridge, North Wales, UK Posts: 654 Joined: 17.10.06 |
Thanks very much. John |
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