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Thread: Request ID for this Arhopala please

  1. #1
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    Default Request ID for this Arhopala please

    Taken in Selangor


  2. #2
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    Arhopala silhetensis.

    The wide spacing between the bands is typical
    HW postdiscal spots 6 & 7 are usually sinuous but may be variously shaped.
    HW band completely dislocated at vein 2.
    FW costal spot 10 usually present (absent here).
    Typical
    http://www.butterflycircle.com/check...-%20horace.jpg
    https://thaibutterflies.com/wp-conte...s-1080x725.jpg

    The two females here have straight-sided HW spots 6 & 7.
    http://yutaka.it-n.jp/lyc4/82240001.html


    TL Seow: Cheers.
    Typical.

  3. #3
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    Thank you so much, Dr Seow! A lifer for me!

  4. #4
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    I don't think this is silhetensis, the wing shape and general appearance doesn't match and the lack of a tornal lobe on the hindwing should indicate that this is a member of the alea subgroup
    Aaron Soh

  5. #5
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    Admittedly there were some doubts right from the start with this individual.

    However, I went through the cleander group ,including the alea subgroup before concluding.

    The complete dislocation of the HW band at vein2 & the arrangement of the FW upper four postdiscal spots put it in the cleander group.
    So it has to be a member of the cleander group. whether subgroup cleander or subgroup alea.

    Here is the analysis.

    1. Most field shots of A. silhetensis do not show a protruding HW tornal lobe. eg.
    https://1.bp.blogspot.com/_rzo8wjfyC..._Annotated.jpg
    https://1.bp.blogspot.com/_rzo8wjfyC..._Female_2A.jpg
    https://www.thaibutterflies.com/wp-c...s-1080x675.jpg

    2. The dislocation of the HW band at vein 2 is typically wide in the cleander subgroup & close in the alea subgroup.
    3 The 'V' spot tend to be better formed in cleander subgroup.
    4. HW postdiscal spots 6 & 7 tends to be quadrate, low in tyhe alea subgroup, & tall & narrow in A. silhetensis.


    Of the members in the alea subgroup, only A. aroa is stated to have the bands widely spaced.
    A. aroa have HW spot 6 typically wide & rounded at the top & narrow at the bottom.
    https://thaibutterflies.com/wp-conte...ala-aroa-1.jpg
    http://yutaka.it-n.jp/lyc4/82180001.html
    See C&P4 plate 67 fig 9.
    See Borneo Lycaenid fig. L211.

    Typical alea subgroup member, probably A. sublustris.
    http://www.butterflycircle.com/check...erry%20Ong.jpg

    You could still be right it might be an alea member, but without further insight I'll leave as it is.


    TL Seow: Cheers.
    Last edited by Psyche; 17-Apr-2021 at 05:26 PM.

  6. #6
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    Thanks, Dr Seow. The alea subgroup is very tough and i always find myself stuck at generic level and unable to proceed further, which is very annoying especially when you can't tell if the variation in different individuals is intraspecific or a species-level sort of difference
    Aaron Soh

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