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Thread: ID help please

  1. #71
    Join Date
    Oct 2009
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    Singapore
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    Aaron, Dr Seow,

    I've been shooting lots of alea-subgroup Arhopala recently and several of them have had much wider fw post-discal bands. This one male which I tracked gave me a glimpse of the upperside, showing the fw border increasing in width towards the apex. The fw termen is also revealed to be evenly curved from the upperside.

    To cut to the chase, I think this is Arhopala selta.



    Last edited by Banded Yeoman; 10-Jul-2019 at 10:16 AM.
    cheers
    Jonathan
    http://nypsbluebottle.blogspot.com/
    --- nothing happens by coincidence - everything is DESTINY ---

  2. #72
    Join Date
    Aug 2007
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    Upper Changi
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    The border is definitely increasing in width but i'm not sure if this is wide enough for selta. Unfortunately this is a very poorly known group and there's very little information online and i don't have my references with me, so i'll let Dr Seow have a say
    Aaron Soh

  3. #73
    Join Date
    Nov 2010
    Location
    Malaysia
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    Agreed it is Arhopala selta..

    You have very clear shots of both surfaces ,so there is no ambiguity.

    Thus it meet all the criteria.
    1. UpF border increases towards the apex.
    2. HW postdiscal spot 6 overlaps the cellend bar by half.
    3. FW termen somewhat rounded.
    Whether the FW postdiscal band is always relatively wide is hard to say.


    Perhaps A. phaenops also occur in Singapore.

    In the thread below, the male have a straight termen , the UpF border appears to be broad at the apex, & HW spot 6 barely overlaps the cellend bar.
    Only the males of selta & phaenops have the UpF border increas at the apex.
    All other males have the FW border a thread throughout.
    http://www.butterflycircle.com/showt...rhopala-for-ID!


    A male labelled as A. sublustris from Cambodia for comparison.
    https://farm5.static.flickr.com/4564...44eda5c2_b.jpg


    TL Seow: Cheers.

  4. #74
    Join Date
    Oct 2009
    Location
    Singapore
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    1,618

    Arrow

    Aaron, Dr Seow, thanks for confirming that for me.

    I based my judgement on the key and plates from the marvellous Butterflies of Borneo, Vol.2 No.1 Lycaenidae (1991) by Yasuo Seki, Yusuke Takanami and Kazuhisa Otsuka. The male A. selta is a strong match to the one I shot.

    Regarding the suspected A. phaenops that I shot a few years back, I'll leave as A. sublustris . Close examination of the hindwing border (which shows in one of the shots) reveals that it is a thread, only increasing in width below vein 2. This is typical of A. sublustris. In A. phaenops the border will be consistently thicker. There is a chance that the forewing border for my suspected A. phaenops is an illusion due to the odd chip off the wing, casting a shadow.

    I have shot a number of typical A. sublustris and the borders are always a thread, with a bright blue upperside. I may post these later.
    cheers
    Jonathan
    http://nypsbluebottle.blogspot.com/
    --- nothing happens by coincidence - everything is DESTINY ---

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