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 Eristalis questions.
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| amaira |
Posted on 23-08-2006 09:48
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 Member Location: Posts: 414 Joined: 13.08.06 |
I?ve got a lot of Eristalis hoverflies here, 40 km NW of Stockholm, Sweden. And of course I?ve a lot of photos of them. Is it possible to determine the spieces on my photos? If it is, can you tell me how? I have numbered the different flies, to make the investigation easier, but there may be the same spieces whith different number, or vice versa. http://www.odla.n...a&aid=5208 |
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| Tony Irwin |
Posted on 23-08-2006 10:51
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 Member Location: Posts: 7168 Joined: 19.11.04 |
Hi Amaira number 6 is Eristalis pertinax - easy to tell because it has pale front tarsi and a long, tapering abdomen. 7, 8 and 9 are all Eristalis tenax. It has a wide, dark stripe on the face, two vertical bands on the eyes and looks most like a drone honeybee. Tony ---------- Tony Irwin |
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| amaira |
Posted on 23-08-2006 12:47
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Member Location: Posts: 414 Joined: 13.08.06 |
You are fantastic Tony! Thankyou!!! |
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| Tony Irwin |
Posted on 23-08-2006 15:25
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Member Location: Posts: 7168 Joined: 19.11.04 |
But 'm not so confident with the rest!  Number 1, 4 and 5 are abusiva females, showing a range of colour variation. Number 2 I think is also abusiva, this time a male, but it looks as though it may have a plumose arista, in which case it's probably arbustorum. E. abusiva is distinguished from similar species by the pale mid tibia, shown in some of your pictures. Number 3 is a fairly robust species, I think a tenax female, though most of the diagnostic features are not visible. Edited by Tony Irwin on 23-08-2006 15:26 Tony ---------- Tony Irwin |
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| amaira |
Posted on 23-08-2006 16:56
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Member Location: Posts: 414 Joined: 13.08.06 |
abusiva? Never heard about. *dizzy* How many Eristalis are existing?  Now I got something to think about |
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| Tony Irwin |
Posted on 23-08-2006 17:36
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Member Location: Posts: 7168 Joined: 19.11.04 |
You are so fortunate in Sweden - you have 18 species of Eristalis. In Britain, we only have 9.  If you go to the Fauna Europaea site (http://www.faunae...ecies_list) and list species in [select genus], type in "Eristalis" then select country "Sweden", then press "display species" you should get a list of all the Swedish species. Edited by Tony Irwin on 23-08-2006 17:37 Tony ---------- Tony Irwin |
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| amaira |
Posted on 24-08-2006 12:51
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Member Location: Posts: 414 Joined: 13.08.06 |
thanks again!!! Today I got the book Danmarks Svirrefluer (Denmarks Hoverflies) in my mailbox.Yippi. There too are all the Eristalis. I have some education doing now see you later. |
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| jorgemotalmeida |
Posted on 24-08-2006 12:55
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 Member Location: Posts: 9295 Joined: 05.06.06 |
Tony Irwin wrote: You are so fortunate in Sweden - you have 18 species of Eristalis. In Britain, we only have 9. If you go to the Fauna Europaea site (http://www.faunae...ecies_list) and list species in [select genus], type in "Eristalis" then select country "Sweden", then press "display species" you should get a list of all the Swedish species. Just 3 in Portugal mainland??? I suppose this must be updated!  |
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