[Syrphidae] Re: syrphid developmental defect? or visual efect?

Thu May 12 14:45:53 BST 2011

Thanks Jean-Pierre,

I also answered something similar to him: "my guess is that is an artifact.
When the fly opens the mouth, some muscle behind the integument moves and
creates a dark spot in the inner side of the face... and that movement
creates the vision of a hole".

I just wante to know if I was right thinking it is an artifact of the
pictures, or somebody has seen something similar.

Best regards,

Ximo

2011/5/12 Jean-Pierre SARTHOU <sarthou at ensat.fr>

> Dear Ximo,
>
> According to me, there is nothing so odd: this "hole" is simply caused by
> the wet and dark proboscis, when pulled up into to buccal cavity, it (or
> more precisely the membrane which links it to the head tegument) touches the
> face tegument (which is more or less transluscent) inside and leads to this
> dark patch on the knob.
> I hope that it is nothing more complicated than that!
>
> Best regards,
> Jean-Pierre
>
>
> Le 12/05/2011 03:37, ximo mengual sanchis a écrit :
>
>  Dear friends,
>
> I'm not a big fan of these things but this forum has an interesting gif
> image (animated picture). My friend Keith sent me the link of a flower fly
> (Epistrophe eligans) with a weird "visual efect". There appears to be a
> mobile hole in the fly's face that opens when it moves its proboscis, the
> gif is mesmerizing and a little grotesque. What do you think caused this?
>
> http://www.fredmiranda.com/forum/topic/1005789
>
>
> Best regards,
>
> Ximo
>
>
>
> --
> ********************************************************
> Dr. Ximo Mengual
> Department of Entomology
> Smithsonian Institution
> PO Box 37012, MRC-0169
> Rm CE-607
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> Phone: +1 (202) 633-1004
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>
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-- 
********************************************************
Dr. Ximo Mengual
Department of Entomology
Smithsonian Institution
PO Box 37012, MRC-0169
Rm CE-607
Washington, D.C. 20013-7012
Phone: +1 (202) 633-1004
e-mail: mengualj at si.edu
http://entomology.si.edu/StaffPages/MengualJ.html

For FEDEX:
Smithsonian Institution
National Museum of Natural History (NHB)
Department of Entomology
10th & Constitution NW
Phone: +1 (202) 633-1004
Washington, DC 20560-0169
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