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Thread: ID requests

  1. #31


    Thank you for the detailed reply Dr Seow!

    I was looking through some iNaturalist observations and this one seems a little different to me with the way the FW post-discal band curves:
    Could it be N.pendleburyi? Of course without dorsals it is difficult to confirm.

    But it matches quite closely to this observation which was IDed as N.pendleburyi,
    Jian Kai

  2. #32
    Join Date
    Nov 2010


    Post 31.

    There is very little correct image of N. pendleburyi
    All known shows the marginal & submarginal spots/bands to be very narrow.
    While the band may be curved in pendleburyi,similar bands are also seen in sanaya & subperusia, & probably several others.
    I would leave it as N. sanaya since the submarginals are large.

    Two images below are definitely N. sanaya males.
    If you use google zoom you can see violet at the apex.
    In N. pendleburyi, it would be black.
    There are examples where the postdiscal band is not dislocated; it would then be curved.

    TL Seow: Cheers.
    Last edited by Psyche; 19-Apr-2023 at 09:18 PM.

  3. #33
    Join Date
    Nov 2010


    Nacaduba subperusia lysa.
    P. Malaysia.

    N. sanaya.
    The key indicates that the space between the submarginal & postdiscal spots in HW spaces 4 & 5 should be at least half the width of the postdiscal band.
    This will only allow those in which the submarginals & postdiscals are almost touching to be excluded.
    The FW submarginal spots have mostly convex margins in subperusia & straight margins in sanaya.
    These examples are probably N. sanaya.
    This one seem close enough to suggest N. subperusia.
    The postdiscal band can not be used to confirm an ID.

    Some shots with narrow FW peripheral bands & wide HW spacing suggest. N. pendleburyi

    TL Seow; Cheers.

  4. #34


    Quite a few of my previously IDed N. sanaya females have the HW post-discal band close to the submarginal band,

    These I'm still fairly confident is still N.sanaya since the HW submarginals are not strongly convex:

    This was the one you pointed out above, but would the HW submarginals be considered convex?

    This one has more convex submarginals and the HW post-discal and submarginal bands are close together, possible for N.subperusia lysa? No better/closer shots unfortunately.

    This observation of a female from Cambodia clearly showing the convex HW submarginals:
    Jian Kai

  5. #35
    Join Date
    Nov 2010


    Post 34.

    1. This is a male & the HW spacing is quite wide. No issue.

    2. This have the HW submarginals with straighter margin so suggest N. sanaya.

    3. This has the HW spacing even closer, HW submarginal spots variable.
    If this is given to someone new, he would IDed as subperusia by the key.
    You can only convinced him by netting a specimen for examination to confirm it.

    4. This appears to be N. hermus.
    A better pic showing the metallic scales.

    Typical N. sanaya females.
    Wallace Collection
    Bred by Horace.
    Panti Forest, Johor.

    TL Seow: Cheers.
    Last edited by Psyche; 22-Apr-2023 at 10:25 PM.

  6. #36


    Hi Dr Seow,

    I got some Arhopalas that I'm not too sure about. I know this group is really difficult for a definitive ID but any pointers would be much appreciated!

    1. Arhopala athada? Thought the HW spots 6 & 7 seem quite different from a typical A.athada. Could it be something else? Shot at Upper Seletar Reservoir.
    photo1696144999 (1).jpeg

    2. Arhopala sublustris? I recall the size was smaller than A.athada. Shot at Bukit Timah Nature Reserve.
    WhatsApp Image 2023-10-01 at 7.22.42 PM.jpeg

    3. alea subgroup. This one was shot in Panti Forest, Johor, Malaysia.
    WhatsApp Image 2023-10-01 at 7.35.53 PM.jpeg

    4. Another alea subgroup from Panti Forest, but no upperside shots.
    Jian Kai

  7. #37
    Join Date
    Nov 2010


    Post 36.

    1. This should be A. silhetensis.
    The two have been frequently confused as there are A. silhetensis with wider spots.
    There is an error in the key line 152.

    HW spots 6 & 7 are oblique, the outer edge of spot 7 is well inside the outer edge of spot 6.
    spot 6, outer margin sinuous, does not overlap spot 5 or the cellend bar.

    2. Arhopala milleri.
    The upperside of the male is less shiny indigo blue .
    In general UnF spot 9 is not shifted inwards from the band or only slightly.
    UnH spot 6 is wider at the top & narrower at the bottom.

    3. Probably correct as A. sublustris female .
    Spot 9 at the costa is often strongly dislocated & shifted inwards.
    UnH spot is wider at the top & narrower downwards, as in milleri.
    Upperside is a bright blue. Female with the brown border of uniform width at the tornus.

    4. This looks the same as 3 & is probably A. sublustris.

    Other species recorded in Singapore.

    A. normani.
    As in sublustris, but UnH spot 6 have straighter side margins.

    A. phanda.
    UnH spot 6 & 7 blocky large arranged like a column.

    A. aroa.
    Underside bands narrow, thus widely spaced apart.
    UnH spot 6 triangular, with the point on thecellend bar.

    Three other species in P. Malaysia, A selta, phaenops, & evans have UnH spot 6 not tapered downwards.

    TL Seow: Cheers

  8. #38


    Thank you Dr Seow!
    Jian Kai

  9. #39


    Hi Dr Seow,

    Shot a alea subgroup member at MacRitchie Nature Trail today, managed to get a shot that shows some of the uppersides. Would this be 'bright blue' or 'matt blue'? In person it seemed as a pretty dark blue to me as it was flying, but I don't really have a good baseline to compare the colours with.
    Last edited by LJK1410; 03-Nov-2023 at 11:50 PM.
    Jian Kai

  10. #40
    Join Date
    Nov 2010


    Yes ,this would be a good example of a male Arhopala sublustris.
    Other examples.
    Formerly as A. ralanda ridleyi.

    A. milleri is described as more matt (ie. less reflective) indigo blue.
    The Satun male have a bit more light.

    A. normani is also a deeper darkish blue.

    TL Seow:Cheers.

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