Thread subject: Diptera.info :: Chetostoma curvinerve?
Posted by blowave on 05-01-2009 21:12
#1
Hi,
I saw this small fly running around on some Ivy, length around 4mm. All I can find on it is that is it not native here, but is here is places apparently. The wing markings seem to match, I have 4 pics so will put them all here.
Date 19th November 2008. Lincoln UK.
Posted by blowave on 05-01-2009 21:14
#2
pic 2
Posted by blowave on 05-01-2009 21:15
#3
pic 3
Posted by blowave on 05-01-2009 21:16
#4
pic 4, not very good but might be of use. Thanks, Janet:)
Edited by blowave on 05-01-2009 21:18
Posted by Tony Irwin on 05-01-2009 21:35
#5
Yes, this is Chetostoma. I hadn't realised it's not native to Britain. Can you give me a reference to this? Thanks
Posted by blowave on 05-01-2009 21:59
#6
Thanks Tony, I couldn't find the page again when I googled, but it was an English Nature document with several pages, the title at the top was to do with non-native species. I did find the name by using the 'find on this page' in edit and wondered if the entire document was to do with the heading but it was a very large heading. Unfortunately I couldn't be bothered scrolling down at the time to see if there was any other headings.
I did find another on a link which I can't open as it's excel, then my computer stopped responding so closed down. :|
I checked the google page and couldn't find the same link!
http://www.google...0&sa=N
Aha, the google page I copied has remained in my copy, there is a mention of uncertainty on a link there. Now I have googled again and found the same page!
http://209.85.229...p;ie=UTF-8
Janet
Edited by blowave on 05-01-2009 22:01
Posted by blowave on 05-01-2009 22:12
#7
If you go to page 6 of the first google link I gave you will find the link titled "XLS] EN_alien_audit" with web address brc.ac.uk
Posted by Tony Irwin on 06-01-2009 01:27
#8
Thanks, Janet - I hadn't seen that report. Quite a bit of speculation in there!
Posted by Nosferatumyia on 06-01-2009 09:25
#9
Why do you think Chetostoma curvinerve is an invasive species in the UK? The only reason it has not been found so far could be its rareness.
Posted by ChrisR on 06-01-2009 11:20
#10
I have recorded
Chetostoma curvinerve in the past and I think at the time it had been known from about 5 UK records. If you check
http://www.faunae... it is listed as British. :)
Posted by Tony Irwin on 06-01-2009 19:02
#11
Nosferatumyia wrote:
Why do you think Chetostoma curvinerve is an invasive species in the UK? The only reason it has not been found so far could be its rareness.
I suspect that it is the fact that at one time it was regarded as a rare species in Britain, but now seems to be much more common. A spreading invasive species would be one explanation, but it could be just more British dipterists looking for flies in the late autumn and early spring, or a response to climate change. Is there any evidence for
Chetostoma being an invasive species elsewhere in its range?
Posted by Nosferatumyia on 07-01-2009 07:38
#12
Tony Irwin wrote:
Is there any evidence for Chetostoma being an invasive species elsewhere in its range?
No. Indeed, it is just because more people collected in a proper time and in proper places.