Diptera.info :: Family forums :: Syrphidae
 Chrysotoxum?
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| kobra |
Posted on 09-08-2014 09:25
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Member Location: Belgium (Flanders) Posts: 152 Joined: 10.12.12 |
I would like to know which species this is. It concerns this sighting: http://observado....w/87031917 identification uncertain Chrysotoxum octomaculatum observed at 2014-07-21 BRD - Haßberge (Landkreis)   thanks in advance Koenraad |
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| ValerioW |
Posted on 09-08-2014 11:26
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 Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
Right ID! It's a male C. octomaculatum |
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| kobra |
Posted on 10-08-2014 09:12
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Member Location: Belgium (Flanders) Posts: 152 Joined: 10.12.12 |
Thank you for the confirmation, Valerio. Ciao, Koenraad |
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| Stephane Lebrun |
Posted on 10-08-2014 09:26
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 Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
Sorry but I disagree, this is not C. octomaculatum : the 3rd antennal segment is well too long and the rim of tergites 3 & 4 is not yellow at level of black front bands. Should be like in the last pictures of this page : http://cyrille.du...illus.html Stephane. |
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| Mark van Veen |
Posted on 11-08-2014 07:49
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 Member Location: Zeist, Netherlands Posts: 145 Joined: 12.05.04 |
C. cautum, I would say. |
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| kobra |
Posted on 11-08-2014 09:36
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Member Location: Belgium (Flanders) Posts: 152 Joined: 10.12.12 |
Thank you for all the info. OK, no C. octomaculatum. So maybe C. cautum or fasciolatum? This may stay uncertain with these pictures, I guess. Regards, Koenraad |
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| ValerioW |
Posted on 11-08-2014 18:34
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
Stephane Lebrun wrote: Sorry but I disagree, this is not C. octomaculatum : the 3rd antennal segment is well too long and the rim of tergites 3 & 4 is not yellow at level of black front bands. Should be like in the last pictures of this page : http://cyrille.du...illus.html I enlarged the photo and I'm totally agree. 3rd antennomere is pretty long. I didn't check the photo for first steps in ID, assuming kobra did already, sorry. |
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| ValerioW |
Posted on 11-08-2014 18:41
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
Mark van Veen wrote: C. cautum, I would say. Without considering wings, cautum can be quite straight, flat abdomen fits. But wings are too much dark on the outer half of front margin. Eyes'pilosity can be a useful trait, but I cannot discriminate it with this resolution. |
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| ValerioW |
Posted on 11-08-2014 18:44
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
kobra wrote: Thank you for all the info. OK, no C. octomaculatum. So maybe C. cautum or fasciolatum? This may stay uncertain with these pictures, I guess. Regards, Koenraad Wing colours are fascicolatum-type, and enlarging the head it appears (please, would you like to check and confirm?) that 3rd antennomere is longer than 1+2. So cautum can be ruled out. I'd say C. cf. fascicolatum |
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| kobra |
Posted on 17-08-2014 10:36
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Member Location: Belgium (Flanders) Posts: 152 Joined: 10.12.12 |
Hi again, I have now cropped a picture of the head - I am not sure that it is clear now, since I am not a specialist, so maybe someone can confirm now?  Regards, Koenraad |
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