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1267 Views 3 Replies Last post: Apr 22, 2013 1:57 PM by awillkey RSS
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Apr 22, 2013 11:40 AM

Is this fly a freak?

I caught this fly a few days ago and when I looked at it on my PC I noticed there was something odd about it.




I think it is a narcissus fly (judging from the pattern of veins on the wings) though the abdomen is not as in my field guide. But what disturb me is the middle leg nearest the camera. It emerges from the thorax half way up the side, not at the bottom where the other legs are. It also doesn't seem to have any joints, but that may simply be that the fly has it extended. Is this normal or a freak?



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    Apr 22, 2013 12:56 PM (in response to awillkey)
    Re: Is this fly a freak?

    I think it's some species of Eristalis, but I'm no fly expert.


    Anyway, I think you're looking at the leading edge of the wing and the hind leg (the one which is resting on an old grass blade) emerges from a point on the thorax which is hidden by the wing.

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      Apr 22, 2013 1:15 PM (in response to jaguarondi)
      Re: Is this fly a freak?


      Thanks jaguarondi! I was about to reply with the same ID: Eristalis sp., looking like E. tenax. I have prepared a photo with the details:


      So, 1 is the front leg, 2 is the middle leg, 3 is the tip of the hind leg, stretched under the wing, 4 is the insertion of wing, not leg, 5 is the place where the hind leg dissapears under the wing, but it looks like it continues because the wing is thicker at its front.



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