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 which Chrysotoxum? -> C. cf. arcuatum
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| Carnifex |
Posted on 04-11-2018 22:35
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 Member Location: Vienna, Austria Posts: 1950 Joined: 23.06.15 |
Hi, from the Austrian Alps (July, elevation about 2000m) - can this female be ID'ed?    Cheers, Lorin Edited by Carnifex on 10-01-2019 01:14 Cheers, Lorin Font Color All requests are from the urban area of Vienna, if not otherwise stated. My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated. |
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| Carnifex |
Posted on 06-01-2019 16:46
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Member Location: Vienna, Austria Posts: 1950 Joined: 23.06.15 |
Bringin this up again. Ch. festivum (formerly arcuatum)?
Cheers, Lorin Font Color All requests are from the urban area of Vienna, if not otherwise stated. My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated. |
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| Sundew |
Posted on 06-01-2019 19:35
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3917 Joined: 28.07.07 |
There had been some taxonomic confusion around Ch. arcuatum and Ch. festivum in the past that was, however, solved by conservation of the names in use and a designation of neotypes for the species in 2001. (If you have a deeper interest, see https://www.biodi...1/mode/1up). So both Ch. arcuatum and Ch. festivum are good species, the first one appears yellow with black markings and the second one appears black with yellow markings. So yours is no Ch. festivum. Unfortunately, there are hardly morphological characters to discriminate between the species in the "yellow group", the colouration is highly variable, and even the male terminalia are mostly uninformative (https://www.resea...characters). Nevertheless, if we follow the key by Van Veen (https://books.goo...&hl=de), we arrive at Ch. arcuatum. The decisive clue is the length of the antennal segments. The wings of the sister species Ch. fasciolatum should have a darker front margin. However, some experts allow such darkened wing parts also for Ch. arcuatum - see https://diptera.i...d_id=60720. So to cut a long story short, you should label your pictures Chrysotoxum cf. arcuatum to be on the safe side. Regards, Sundew |
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