Diptera.info :: Identification queries :: Diptera (adults)
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 Billaea kolomyetzi (was 'Unknown dexiine')
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| ChrisR |
Posted on 15-12-2009 00:30
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 Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
This one has been driving me crazy for days - does anyone recognize what it could be? It is from Estonia in 1.08.2005. The antennae are slightly hairy (hairs not long enough to be 'plumose'  with a slight ridge between the antennae; deep gena; eyes bare ... if anyone wants more info just ask 
ChrisR attached the following image:  [53.99Kb] Edited by ChrisR on 17-12-2009 10:33 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| ChrisR |
Posted on 15-12-2009 00:31
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
lateral view...
ChrisR attached the following image:  [60.76Kb] Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Zeegers |
Posted on 15-12-2009 09:04
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
First impression is Billaea kolomyetzi, which have driven me crazy as well at times. We need to work through the features, however, at the moment I have no time for this. I'll come back to it or Jaakko or Erikas might have more experience with this species. By the way: B. maritima sensu Kolomyetz = kolomyetzi Mesnil Theo |
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| ChrisR |
Posted on 15-12-2009 11:38
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Thanks Theo - really helpful. The most recent attempt (after a lot of pushing) took me to Billaea but I ran to the final couplet in T&H without much confidence so decided that it was another dead end. But the distribution certainly looks good for kolomyetzi I notice that Billaea kolomyetzi isn't in T&H - does anyone have a PDF of the key that covers it? 
Edited by ChrisR on 15-12-2009 11:39 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Paul Beuk |
Posted on 15-12-2009 12:26
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 Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
I think you'll need: Mesnil, L.P., 1970. Description de nouveaux tachinaires de l’Ancien Monde, et notes synonymiques (Diptera, Tachinidae). - Mushi 44, 89–123. Not in our library, I'm afraid. Paul - - - - Paul Beuk on https://diptera.info |
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| ChrisR |
Posted on 15-12-2009 13:16
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Hmm... Google hasn't come up with a copy either  If anyone can suggest key changes to Tschorsnig & Herting (1994) I'd be happy to add them in to my copy and update the online version ... that goes for all genera Where I have useful additions to T&H I add them in a different colour or as margin comments to differentiate them from the original translation
Edited by ChrisR on 15-12-2009 13:22 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Jaakko |
Posted on 15-12-2009 16:03
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
I have a key somewhere, (isn't maritima in T&H?), need to dig for it. Based on JariF's images, I'm pretty sure that this is Billaea kolomyetzi. I haven't seen it myself... Best, J. |
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| Paul Beuk |
Posted on 15-12-2009 16:33
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Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
Billaea maritima is not in T&H.
Paul - - - - Paul Beuk on https://diptera.info |
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| Zeegers |
Posted on 15-12-2009 17:50
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
I will email my personal central european key to Paul, hope he can put it somewhere on the site. Theo |
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| Paul Beuk |
Posted on 15-12-2009 17:55
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Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
I cannot imagine that will prove to be a problem.
Paul - - - - Paul Beuk on https://diptera.info |
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| ChrisR |
Posted on 15-12-2009 19:17
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Zeegers wrote: I will email my personal central european key to Paul, hope he can put it somewhere on the site. Superb! Would you mind if I translate & include your margin-notes in my English translation of the key?
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Zeegers |
Posted on 15-12-2009 21:04
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
I'll send you both You can pay me 'in nature', as we say in dutch (ie. Billaea's! Theo |
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| Paul Beuk |
Posted on 15-12-2009 21:41
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Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
Here it is in pdf format.
Paul Beuk attached the following file: billaea.pdf Paul - - - - Paul Beuk on https://diptera.info |
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| Zeegers |
Posted on 16-12-2009 17:51
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
Thanks Paul Theo |
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| Zeegers |
Posted on 16-12-2009 21:48
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
Clearly central vitta is present. SO it is not kolomyetzi, but fortis or steini. It was already more bulkier than the kolomyetzi I'd seen. SO Chris, what is it gonna be ? Theo |
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| ChrisR |
Posted on 16-12-2009 22:07
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
OK if the faint central vittus is good enough to qualify then we proceed... There are no marginals on T1+2 ... a bristle in this position has actually just detached itself some somewhere else and seems to be stuck upside down. So not B.irrorata. The longest hairs on the arista are just longer than the width of the base of the arista; there are 2 sternopleurals; the 2nd antennal segment is reddish/brownish/dark-orangeish... but there are 3 strong pre-sutural acrostichals ... so I would go for B.steini The only slight problem is T&H's secondary feature "Tergites 3 and 4 with trapezoid dark spots" ... which this doesn't have at all. Did you omit this feature because you heard that it is unreliable?
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Zeegers |
Posted on 16-12-2009 22:23
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
OK Point taken. It must be kolomyetzi, there is no other option, this central vitta (Chris: it is vitta, pl. vittae) is very annoying, must be accidental or aberrant. Theo |
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| ChrisR |
Posted on 16-12-2009 22:33
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Zeegers wrote: It must be kolomyetzi, there is no other option, this central vitta (Chris: it is vitta, pl. vittae) is very annoying, must be accidental or aberrant. Thanks - I didn't study latin - and it shows I would be happy making it B. kolomyetzi but it would certainly be nice to see a specimen of B.steini just to know what they look like. The central vitta is much fainter than the others and that probably doesn't show very well in the photos (a side-effect of sharpening perhaps). But the problem will be tracking down any specimens of steini at all, I think ... I have asked Peter whether he has any
Edited by ChrisR on 16-12-2009 22:34 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| ChrisR |
Posted on 17-12-2009 10:29
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Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Just a quick update. Peter Tschorsnig has been in touch regarding this thread and he says: The colouration of the abdomen is typical for males of Billaea kolomyetzi, thus I would not doubt that the specimen on the photo belongs to this species. B. kolomyetzi is known from Finland, Estonia and Poland, so it is a nice, but not a surprising record. The number of presutural dark thoracic stripes is (unfortunately) not quite constant, it is normally four but can also be five in single specimens. So perhaps the keys need a caveat that allows for a fainter central stripe in some individuals that would normally only have 4 stripes?
Edited by ChrisR on 17-12-2009 10:31 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Jaakko |
Posted on 17-12-2009 12:28
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Hi, Regarding Theo's key. In B-B B. microcera Rd. = "real" maritima. How about B. ringdahli Vill. and B. subrotundata Rd.? I can't find any synonyms for them. According to B-B steini should look like: 3rd segment of ant. not more than twice length of 2nd; latter reddish yellow. t 3 and t 4 with large triangular dark overlapping spots. So I don't think this is steini as the triangles should be obvious (compare to B. triangulifera!). |
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