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Thread: An interesting, aberrant Arhopala

  1. #11
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    Quote Originally Posted by Psyche View Post
    The diagnostic ID for A. avanthina is that the FW basal cellspot is absent.
    In the image all three cellspots are present. ie. one at cellend, one at mid cell & the 3rd basal (actual position is sub-basal).
    Could this be variable? D'abrera figures a specimen with the basal cell spot
    Aaron Soh

  2. #12
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    Quote Originally Posted by atronox View Post
    Could this be variable? D'abrera figures a specimen with the basal cell spot
    The key in C&P4 is quite specific in this differentiation.

    Still , this should be easy to test.

    The upperside FW border is a thread in the male A. kurzi.
    https://singapore.biodiversity.onlin...doptera-000440

    The upperside border in A. avathina is much wider , 1mm.
    https://m.singapore.biodiversity.onl...doptera-000436


    TL Seow: Cheers.

  3. #13
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    Dr Seow, Aaron, thanks for your views on this one. I continue to learn.

    The feature of fw basal spot missing is unhelpful in my limited opinion. Even the holotype of A. avathina clearly shows fw sub-basal spots - and if the characteristic truly was regarding the basal spot, which is sometimes discernable in very pristine examples of muta, kurzi etc, it is often too faint to use as a distinguishing feature.

    I would be hesitant to id this one as A. kurzi.

    It now becomes clear that even in A. kurzi, the sub-marginal spots are rather dark and defined. From all valid A. kurzi specimens that I've seen, however, the forewing band is distinctively broken at each vein for spots 4, 5 and 6. These are specimens with upperside confirmation.

    A. avathina, in the holotype from Singapore, displays fw post-discal spots very well aligned. This is also seen in CJ's shot (post 9).

    Dr Seow, your point of separating these 2 species by upperside is definitely the most solid method. They prove to be very similar on the underside.
    cheers
    Jonathan
    http://nypsbluebottle.blogspot.com/
    --- nothing happens by coincidence - everything is DESTINY ---

  4. #14
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    Quote Originally Posted by Banded Yeoman View Post
    Dr Seow, Aaron, thanks for your views on this one. I continue to learn.

    The feature of fw basal spot missing is unhelpful in my limited opinion. Even the holotype of A. avathina clearly shows fw sub-basal spots - and if the characteristic truly was regarding the basal spot, which is sometimes discernable in very pristine examples of muta, kurzi etc, it is often too faint to use as a distinguishing feature.

    I would be hesitant to id this one as A. kurzi.

    It now becomes clear that even in A. kurzi, the sub-marginal spots are rather dark and defined. From all valid A. kurzi specimens that I've seen, however, the forewing band is distinctively broken at each vein for spots 4, 5 and 6. These are specimens with upperside confirmation.

    A. avathina, in the holotype from Singapore, displays fw post-discal spots very well aligned. This is also seen in CJ's shot (post 9).

    Dr Seow, your point of separating these 2 species by upperside is definitely the most solid method. They prove to be very similar on the underside.

    If you look at the heading in the link, it says Arhopala avathina avathina Corbet 1941.
    Corbet was the author of A. avathina & he wrote the key first based on his holotype specimen.
    The image is too blur & vague to say there is a FW basal spot.
    https://m.singapore.biodiversity.onl...doptera-000436
    My point is if there is a basal spot in this holotype then Corbet would not have written otherwise.

    The 2nd point to note is that FW postdiscal spot in space 3 is when fully developed extend towards the base ie elongate horizontally in A. kurzi.

    3rdly A kurzi was recorded in Singapore, and as a species is not rare as in A. avathina.




    TL Seow: Cheers.

    PS. Having a close scrutiny of the image od A. avathina, there does seem to be a basal spot on the left side FW.
    Unfortunate there also is a label of Hewitson's A. hypomuta. This raise a question of whether there is a mixup with the specimen.
    Last edited by Psyche; 25-Jul-2019 at 01:11 AM.

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