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Thread: Help needed to ID a Nacaduba

  1. #1
    Join Date
    Apr 2021
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    Singapore
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    Default Help needed to ID a Nacaduba

    ID needed.JPG

    Hi appreciate some help identifying this Nacaduba. Sorry for the grainy nature of the photo. Thanks in advance!

  2. #2
    Join Date
    Aug 2007
    Location
    Upper Changi
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    Default

    Most likely a worn out Nacaduba calauria
    Aaron Soh

  3. #3
    Join Date
    Nov 2010
    Location
    Malaysia
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    5,947

    Default

    Concur it is likely a male Nacaduba calauria.

    The ID of 6Line blues can be confusing at times.
    Intermediates (crosses) occur & add to little variations.

    Great difficulties especially between N. berenice & calauria.

    The two species have the dark lines within the bands well-developed in the males (not so in the males of beroe & kurava).


    N. calauria ; FW postdiscal ( main) band almost always straight & entire.
    FW submarginal spots 4 & 5 sharply pointed & triangular.
    Upperside darkish purple/violet blue.

    Note the dark purplish upperside.
    https://wanderingbutterflyeffect.fil...b3ad98860e.jpg
    https://species.wikimedia.org/wiki/F...caMUpUnAC1.jpg


    N. berenice; very variable
    FW main band typically broken, dislocated or angulated.
    FW submarginal spots 4 & 5 various shape, may also be pointed.
    Upperside pale lavender blue ,frosted appearance, with white dusting. (due to abundant long white ribbon scales)

    Males showing bit of upperside.
    http://4.bp.blogspot.com/-pzK2I4_Ew6...nice-icena.jpg
    http://1.bp.blogspot.com/-xFQx2YUBf8...nice+icena.jpg
    http://3.bp.blogspot.com/-_UgE_Hi1aC...nice+icena.jpg
    http://2.bp.blogspot.com/-2z1tHnAAtb...8male%2529.jpg
    The upperside male & female from China are as for the subspecies here.
    https://lepidoptera.eu/species/15847


    Confusing specimens are lodged in the NHMUK.

    1. N. calauria.
    Underside with submarginal spots sharp but the main band is broken in the middle.
    Upperside dull dusted look.
    https://singapore.biodiversity.onlin...0141?imageId=1
    Compare with upperside of a correct N. calauria which have a purplish gloss.https://species.wikimedia.org/wiki/F...caMUpUnAC1.jpg
    https://species.wikimedia.org/wiki/F...caMUpUnAC1.jpg
    This suggest this is probably N. berenice.

    2. Nacaduba beroe female.
    The underside FW with a large inner costal(forward margin) spot IDed it as N. berenice female.
    The upperside lacks the whitish submarginal spots of N. beroe female.
    https://singapore.biodiversity.onlin...0139?imageId=0

    Female beroe upperside. ( I think this belongs to Sunny)
    nacaduba beroe female UP S5J 05122017 15mm -SAMPLE.JPG

    TL Seow: Cheers.
    Last edited by Psyche; 13-Apr-2021 at 07:01 PM.

  4. #4
    Join Date
    Apr 2021
    Location
    Singapore
    Posts
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    Default

    Thank you Aaron!

    Thank you Dr Seow for the detailed information. Itís always a challenge to spot the differences between berenice and calauria. The presence of intermediates, does this mean they are cross breeding?
    Last edited by Gavin Chan; 14-Apr-2021 at 11:01 AM.
    Best Wishes,
    Gavin

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