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Thread: Nacaduba IDs needed.

  1. #1
    Join Date
    Mar 2008
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    Seng Kang
    Posts
    1,642

    Default Nacaduba IDs needed.

    Dear Dr Seow,
    Pls help to ID the following Nacaduba species, thanks!

    R1.JPG
    R2.JPG
    Cher Hern

  2. #2
    Join Date
    Nov 2010
    Location
    Malaysia
    Posts
    7,056

    Default

    Both are male Nacaduba berenice.

    The 6-Line Blues may be ided thus.
    NACAB6.png
    A. Dark striae within the bands strongly developed in both sexes.

    A1 Nacaduba berenice.
    Upperside pale lavender blue in the male .Female pale blue.
    UnF postdiscal band almost always dislocated or crooked or distorted in some way.
    UnF submarginal spots variable, irregular.
    UnF with a costal spot above the midcell band.
    Males.
    https://www.butterflycircle.com/chec...ce_male_01.jpg
    https://www.butterflycircle.com/chec...obby%20Mun.jpg
    https://www.inaturalist.org/observations/184357226
    https://www.inaturalist.org/observations/161213020
    https://static.inaturalist.org/photo...786/large.jpeg
    Females.
    https://www.butterflycircle.com/chec..._female_01.jpg
    https://www.inaturalist.org/observations/152344058
    Added.
    https://www.inaturalist.org/observations/223317061
    https://www.inaturalist.org/observations/81553866



    A2 Nacaduba calauria.
    UnF postdiscal band almost always straight or slightly curved.
    UnF submarginal spots 4 & 5 mostly triangular & pointed.
    Innermost costal spot present.
    UpF dark violet blue in male; Female patch also dark violet.
    Males.
    https://www.butterflycircle.com/chec...--Jonathan.jpg
    Male- left.
    https://www.butterflycircle.com/chec...enry%20Koh.jpg
    https://www.inaturalist.org/observations/215419158
    https://www.inaturalist.org/observations/198791557
    https://www.inaturalist.org/observations/86060926
    Females.
    https://www.butterflycircle.com/chec...yica---2--.jpg
    Female- left. The male below is unusual in that FW spots 4 & 5 are blunt (hybrid element?)
    https://www.inaturalist.org/observations/104467485



    B. Dark striae within the band obsolete or weak in the male ;in female weaker than in group A.
    Male FW margin rather straight.


    B1. Nacaduba beroe.
    UnF costal spot above the midcell band always absent.
    UnF postdiscal band always with a mid or more dislocation.
    Submarginal spots variable.
    Male upperside deeper violet-blue; female FW patch darkish blue with white submarginal spots.
    Males.
    https://www.butterflycircle.com/chec...lt_male_01.jpg
    https://www.butterflycircle.com/chec...ixLineBlue.jpg
    https://www.inaturalist.org/observations/115695707
    https://www.inaturalist.org/observations/109522376
    https://www.inaturalist.org/observations/95242255
    https://www.inaturalist.org/observations/95242254
    Females .
    https://www.inaturalist.org/observations/181540107
    https://www.inaturalist.org/observations/160725153
    https://inaturalist-open-data.s3.ama...323/large.jpeg


    B2 Nacaduba kurava.
    UnF postdiscal band almost always straight.
    UnF submarginal spots mostly large with rounded margins. HW spot 6 similarly large
    UnF costal spot above midcell band almost always present.
    Male upperside deeper blue than berenice with see-thru underside markings ; female with FW blue patch whitened at apex.
    Males.
    https://www.butterflycircle.com/chec...ue-SunnyC2.JPG
    https://www.butterflycircle.com/chec...neBlue-KSK.JPG
    https://www.butterflycircle.com/chec...ze%20Siong.jpg
    https://www.inaturalist.org/observations/126301432
    https://www.inaturalist.org/observations/153437083
    Females.
    https://www.butterflycircle.com/chec..._female_01.jpg
    https://www.inaturalist.org/observations/193867296
    https://www.inaturalist.org/observations/77824453




    Ionolyce helicon.
    The males & females are sometimes confused with Nacaduba beroe.
    Perpective distortion can drastically alter the wingshape.

    Nacaduba beroe .UnH submargnal spot 3 (just beside the black tornal spot) is rounded.
    eg females.
    https://www.inaturalist.org/observations/73602464
    https://www.inaturalist.org/observations/16479565

    In Ionolyce helicon UnH submarginal spot 3 is always sharp pointed.
    females.
    https://www.inaturalist.org/observations/199863087
    https://www.inaturalist.org/observations/202142216



    TL Seow; Cheers.
    Last edited by Psyche; 18-Jun-2024 at 12:36 AM.

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