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Thread: Id help for Dacalana

  1. #1
    Join Date
    Jun 2020
    Location
    Tripura, North Eastern India
    Posts
    27

    Default Id help for Dacalana

    Good evening Dr. Seow Sir

    My suspected id is Dacalana cotys, due to its thickened/wide white band on underwing, & the band not widening towards costa (id keys collected from this forum). I guess it is female, looking at the prominent white spot on the upper forewing.

    But the black merginal border on hindwing is wide, which is suppose to be unusual for cotys?

    The female cotys on this link, collected from Cherrapunjee, Meghalaya matches the UFO

    https://en.m.wikipedia.org/wiki/File...Un_486_AC1.jpg

    However I failed to find any confirm image of penicilligera female.

    IMG_20210723_203300.jpg

    IMG_20210723_203346.jpg

    IMG_20210723_203429.jpg

    Thank you in advance

  2. #2
    Join Date
    Nov 2010
    Location
    Malaysia
    Posts
    6,002

    Default

    It is Dacalana cotys female.

    Past discussion is flawed by the confusing images on the web.
    The white markings are variable ? seasonal.


    The two species can readily be separated thus.

    Dacalana cotys.
    FW postdiscal dark line midway between the termen(outer margin) and the white discal band.
    https://www.ifoundbutterflies.org/me...a3c9bcf8-2.jpg
    https://www.ifoundbutterflies.org/me...962c28e4-2.jpg
    https://en.m.wikipedia.org/wiki/File...Un_486_AC1.jpg
    https://en.wikipedia.org/wiki/Dacala...lana_cotys.JPG



    Dacalana penicilligera.

    FW postdiscal dark line much nearer the termen than the discal white band.
    https://indiabiodiversity.org/species/show/281551
    https://thaibutterflies.com/Butterfl...penicilligera/
    https://en.wikipedia.org/wiki/Dacala...icilligera.jpg

    The female D. penicilligera have the FW margin straighter as in the male but the postdiscal line is lunulate.
    http://www.flutters.org/home/photoga...ddin_zadid.jpg
    https://www.ifoundbutterflies.org/me...fa4c3495-1.jpg


    TL Seow: Cheers.
    Last edited by Psyche; 24-Jul-2021 at 12:02 PM.

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