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Thread: ID request: Yellow Archduke? USR

  1. #1
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    Default ID request: Yellow Archduke? USR

    Dear Dr Seow,

    May I know if the attached is a Yellow Archduke or Dark Archduke?

    Thank you.

    Tim
    Attached Images Attached Images

  2. #2
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    It is a female Lexias canescens.

    There is a series of 5 spots parallel to the lower margin of the FW.
    The 3rd spot (ie middle of the five) is single .

    The male have the antennal tip black.
    In the female the tip is orange shaded black .

    Males.
    https://4.bp.blogspot.com/-X5LrsCHXB...hduke-KSK3.jpg
    Below, note 3rd spot is partially split.
    https://1.bp.blogspot.com/-jVWJ0uJjG...-DavidChan.jpg

    Females.
    https://1.bp.blogspot.com/-aFDi932jw...uke-KohCH2.jpg
    https://1.bp.blogspot.com/-ojWkHn5QE...hduke-JonS.jpg

    Pair. The fresh female is at the bottom.
    https://3.bp.blogspot.com/-fSFenHiLU...e-NelsonO2.jpg



    In L. pardalis & dirtea females, the 3rd spot is completely split into two.


    Female L. pardalis.
    https://upload.wikimedia.org/wikiped...n_archduke.jpg

    Female L. dirtea.
    https://www.butterflycircle.com/chec...erick%20Ho.jpg



    TL Seow: Cheers.

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    Thank you, Dr Seow.

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    Hi Dr Seow,

    Do you think the attached is Lexias pardalis? _DSC3916_01.JPG
    Attached Images Attached Images

  5. #5
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    Post 3.
    Female Lexias dirtea. (Possibly some gene introgression from L. pardalis.)


    LEXIAS1.png
    In the past there have been some confusion between L. dirtea & pardalis.


    Lexias pardalis .
    Antennal club with the apical third orange.
    This orange extend all round the club, though occasionally a thin black line may continue to the tip.
    The underside of the club is orange.
    The female generally have yellow spots, & the 4th spot parallel to the lower margin is more elliptic.
    https://www.inaturalist.org/observations/120917103
    https://www.inaturalist.org/observations/137251675
    https://www.inaturalist.org/observations/145488952
    https://www.inaturalist.org/observations/165903737
    https://www.inaturalist.org/observations/172506114
    https://www.inaturalist.org/observations/184680007
    https://www.inaturalist.org/observations/121981372


    Lexias dirtea.
    Antennal club all black above.The black may be wanting along the edges.
    Underside of club orange as in L. pardalis.( This has cause a lot of confusion.)
    Side view of club shows black extending to the tip along the upper edge.
    Female 4th spot tend to be long & narrow; spots more often white & blue tinged.
    https://www.inaturalist.org/observations/112828149
    https://www.inaturalist.org/observations/128747587
    https://www.inaturalist.org/observations/143999120
    https://www.inaturalist.org/observations/153806407
    https://www.inaturalist.org/observations/155277769
    https://www.inaturalist.org/observations/175484832
    https://www.inaturalist.org/observations/183618229

    There are many examples which appear intermediate.
    The two species are very closely related & could easily cross.

    eg. The apical third of the antennal club appear to be lightly dark-shaded.
    https://www.inaturalist.org/observations/181493424

    General yellower appearance suggest L. pardalis.
    https://www.inaturalist.org/observations/172974879

    The topside of the club have the black extending to the tip.
    A top view would help a great deal.
    https://www.inaturalist.org/observations/127114530

    TL Seow: Cheers.
    Last edited by Psyche; 26-Sep-2023 at 08:09 PM.

  6. #6
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    Thank you Dr Seow, that is very interesting. There are natural hybrids around. Next time I shall try to take photos from different angles.
    Tim

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    Hi Dr Seow, I also come across these two Lexias canescens. The one on the right is much bigger.
    Tim_DSC3905_01.JPG_DSC3909_01.JPG

  8. #8
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    Post 7.

    Mst likely the left one is male & the right one is female.
    The sexes can be very hard to separate.
    Even females may have the antennae very dark in fieldshots.

  9. #9
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    Quote Originally Posted by Yam Tim Wing View Post
    Hi Dr Seow,

    Do you think the attached is Lexias pardalis? _DSC3916_01.JPG

    In this previous shot, there appear to be a strong hybrid element.
    In normal L. pardalis the orange antennal tip is visible without any adjustment.
    https://inaturalist-open-data.s3.ama...2114/large.jpg
    https://inaturalist-open-data.s3.ama...9634/large.jpg
    https://inaturalist-open-data.s3.ama...0614/large.jpg

    Likewise for L. dirtea. the antennal tip is clearly black.
    https://inaturalist-open-data.s3.ama...448/large.jpeg
    https://inaturalist-open-data.s3.ama...2904/large.jpg
    https://inaturalist-open-data.s3.ama...9869/large.jpg

    This one looks intermediate but does have a lot of black shading on top.
    I feel it is closer to L. dirtea.
    But do make your own judgement.




    TL Seow:Cheers.

  10. #10
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    Thank you so much, Dr Seow.

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