Gallery Links
Users Online
· Guests Online: 7

· Members Online: 1
JPecca

· Total Members: 4,809
· Newest Member: James Trager
Forum Threads
Theme Switcher
Switch to:
Last Seen Users
· JPeccaOnline
· Tony Irwin00:10:14
· Nosferatumyia00:18:54
· Juergen Peters00:23:56
· Carnifex00:29:10
· Zeegers00:33:19
· daveb2101:09:33
· evdb02:10:47
· Jan van Duinen02:13:53
· timbuk02:33:38
Latest Photo Additions
View Thread
Diptera.info :: Family forums :: Syrphidae
Who is here? 1 guest(s)
 Print Thread
Chrysotoxum cautum? --> Chrysotoxum cf. verralli
HTK
#1 Print Post
Posted on 27-06-2022 22:03
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Wasp-like syrphid visiting bindweed flowers on a sunny margin at the base of the renatured old mining dump at Landweiler-Reden (Saarland, Germany) on 18 June 2022. Size about 13 to 15 mm. Obviously one of the Chrysotoxum species, which are rather difficult to separate. I would suggest Chrysotoxum cautum (relative length of the antennal segments, shape and amount of yellow markings on the abdomen). Can this be confirmed? I have slightly rephrased the question, added another picture and am looking forward to your opinion.


Image 1
HTK attached the following image:


[174.67Kb]
Edited by HTK on 07-07-2022 20:04
 
HTK
#2 Print Post
Posted on 27-06-2022 22:03
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Image 2
HTK attached the following image:


[179.83Kb]
 
HTK
#3 Print Post
Posted on 27-06-2022 22:04
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Image 3
HTK attached the following image:


[180.98Kb]
 
HTK
#4 Print Post
Posted on 27-06-2022 22:04
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Image 4
HTK attached the following image:


[169.18Kb]
 
HTK
#5 Print Post
Posted on 01-07-2022 19:26
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Image 5
HTK attached the following image:


[182.9Kb]
 
treebeard
#6 Print Post
Posted on 05-07-2022 12:57
Member

Location: Slovakia
Posts: 564
Joined: 13.08.13

Pictures are not large enough to measure antenna segments (in Ch. cautum the 3rd segment should be as large as other two segments together - it does not seem to be the case of your picture), however, my impression is Chrysotoxum verralli (yellow strips on tergites are triangular).

Ch. cautum's abdomen has a different pattern.

Best regards, Matej (not an expert)
 
HTK
#7 Print Post
Posted on 07-07-2022 20:01
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Hello Matej,
thank you very much for your helpful comments. It's certainly no coincidence that Ball and Morris speak of the "difficult five" with the two species under discussion among them.
Kind regards,
Hans Theo
Edited by HTK on 07-07-2022 20:02
 
HTK
#8 Print Post
Posted on 11-07-2022 13:24
Member

Location: Mechernich-Satzvey (near Cologne), Germany
Posts: 226
Joined: 16.05.13

Hallo Matej,
this is to let you know that Ximo Mengual, who is a syrphid expert, in the meantime had a closer look at the pictures and confirms your view. He definitely excludes Chrysotoxum cautum. His comments:
- C. cautum has the scutellum yellow, with a transparent marking in the center; your specimen has a clear black marking on scutellum.
- C. cautum has the basoflagellomere (postpedicel) almost equal in length as scape and pedicel together; your specimen has the postpedicel shorter than pedicel+scape.
Ximo also thinks that the photographed specimen looks very much like Chrysotoxum verralli.
Best wishes,
Hans Theo
Edited by HTK on 11-07-2022 13:25
 
Jump to Forum:
Similar Threads
Thread Forum Replies Last Post
Chrysotoxum intermedium? (4 pics) Syrphidae 6 15-08-2022 08:26
Chrysotoxum? Syrphidae 3 14-07-2022 13:56
is it perhaps Chrysotoxum festivum? => confirmed Syrphidae 7 09-07-2022 12:48
Chrysotoxum festivum?, ♀? --> yes but male Syrphidae 4 06-06-2022 09:55
Chrysotoxum festivum << male Chrysotoxum sp. << Scaeva pyrastri? Syrphidae 5 05-06-2022 06:03
Date and time
09 December 2022 16:53
Login
Username

Password



Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Temporary email?
Due to fact this site has functionality making use of your email address, any registration using a temporary email address will be rejected.

Paul
Donate
Please, help to make
Diptera.info
possible and enable
further improvements!
Latest Articles
Syrph the Net
Those who want to have access to the Syrph the Net database need to sign the
License Agreement -
Click to Download


Public files of Syrph the Net can be downloaded HERE

Last updated: 25.08.2011
Shoutbox
You must login to post a message.

09.10.22 17:07
Yes, dipterologists from far abroad, please buy your copy at veldshop. Stamps will be expensive, but he, the book is unreasonably cheap Smile

07.10.22 11:55
Can any1 help out with a pdf copy of 1941 Hammer. Vidensk. Meddel. Dansk Naturhist. Foren. 105; thank you

05.10.22 19:59
Found! https://www.veldsh
op.nl

05.10.22 19:53
@zeegers, your book seems difficult to get from Spain, is there another way?

08.09.22 09:29
Ladies and gentlemen https://jeugdbonds
uitgeverij.nl/prod
uct/families-of-fl
ies-with-three-pul
villi/

26.08.22 15:06
Lis - This is vol.11 (eleven) and is 346 pages. Sorry, don't have a copy.

15.08.22 14:22
Hello, can any1 help out with a copy of Catalogue of Palaearctic Diptera II: Scathophagidae-Hyp
odennatidae? or at least how many pages it is? thx

19.06.22 07:42
I can not post an image - I do all right - dont know what to do! Gunther

24.05.22 11:28
Hi! would anyone be able to send on a scan of Delia sanctijacobi redescription from: GRIFFITHS, G.C.D. 1993. Anthomyiidae [part]. In: Flies of the Nearctic Region, 8(2), 10. Thank you!

18.05.22 16:26
Delay, alas, due to Covid related issues. But it will be published !!

Render time: 2.66 seconds | 172,504,626 unique visits