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Thread: Arhopala atosia or lurida?

  1. #1
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    Default Arhopala atosia or lurida?

    Found this Arhopala recently and didn't give much thought about it because i thought it was just another epimuta until i compared this to my other epimuta shots and noticed a few differences. The post-discal series on the hindwing seems quite different and i was wondering if it could be either an atosia or lurida that has lost its tails? The wing shape is also quite different.

    Arhopala atosia best cropped resized-min.jpg

    Here is a mating pair of what i know is definitely epimuta and you can see even the male(the one on the right) has more rounded wings than the above specimen.

    Arhopala epimuta best cropped resized-min.jpg

    Thoughts?
    Aaron Soh

  2. #2
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    I actually thought you might have A. lurida because HW spot 4 & 5 are in line.

    It is A. epimuta.
    In A epimuta the dark marginal lines on both sides of vein 2 meet it straight on.
    The shape of the spots can be deceptive.
    https://www.thaibutterflies.com/wp-c...a-1080x675.jpg
    http://2.bp.blogspot.com/-onGDL0mCBh...uta+epiala.jpg
    http://3.bp.blogspot.com/-5yEN0kzk_K...E_adult_02.jpg

    In the tailed species the dark marginal lines on both side of vein 2 curved down into the tail.
    http://www.butterflycircle.com/check..._atosia_01.jpg
    http://1.bp.blogspot.com/-TQqlnu16fF...0/DSC_0136.JPG
    http://3.bp.blogspot.com/-VQ_bV9tsmj...la++lurida.jpg

    Where the tail is broken off, the curving of the dark marginal lines is still evident.
    https://species.wikimedia.org/wiki/A...daMUpUnAC1.jpg

    TL Seow: Cheers.

  3. #3
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    Quote Originally Posted by Psyche View Post
    In the tailed species the dark marginal lines on both side of vein 2 curved down into the tail
    By this do you mean that the marginal lines taper as they approach the tail from both sides?

    Also, for this group is the roundness of the spots critical for ID or is this also subject to variation? What about the clarity of the markings? Am asking because, for epimuta, this would be the most extreme, non-aberrant variant i've ever seen

    Thanks
    Aaron Soh

  4. #4
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    Quote Originally Posted by atronox View Post
    By this do you mean that the marginal lines taper as they approach the tail from both sides?

    Also, for this group is the roundness of the spots critical for ID or is this also subject to variation? What about the clarity of the markings? Am asking because, for epimuta, this would be the most extreme, non-aberrant variant i've ever seen

    Thanks

    I would have thought the images are self-explanatory.
    In both A. lurida & atosia, the black margins on either of vein 2 curved out & converged to form a shallow 'V'.
    Likewise the narrow white marginal band adjacent to them also do the same.
    A. lurida.
    http://4.bp.blogspot.com/-RsKPooOdJp...rida+(TBC).jpg
    A. atosia.
    http://1.bp.blogspot.com/-TQqlnu16fF...0/DSC_0136.JPG

    Even if the tail is broken the 'V' features remain intact as seen below.
    https://species.wikimedia.org/wiki/A...daMUpUnAC1.jpg

    Your pix has a perpective distortion which make the FW appear too broad & may affect the shape of the spots ( ie. spots 6 & 7 are stretched horizontally).
    It is somewhat like this Palmking. You may want to compare the shape of your specimen with the A. lurida given earlier.
    https://www.flickr.com/photos/jayjayc/2116918581/

    Horace example of A. epimuta also have rounded HW spots 6 & 7, so I can't see it as abnormal.
    http://3.bp.blogspot.com/-5yEN0kzk_K...E_adult_02.jpg
    Also this male from Brunei.
    https://en.wikipedia.org/wiki/Arhopa...aMFUpUnAC1.jpg

    TL Seow: Cheers.
    Last edited by Psyche; 17-Jun-2018 at 07:25 AM. Reason: clarification

  5. #5
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    Ok i see what you mean. It is very subtle though. I'll need to look at more images to be more confident about the appearance of this character. Thanks Dr Seow
    Aaron Soh

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