Iscadia inexacta (Walker, 1858)
(previously known as Gadirtha inexacta)
SARROTHRIPINAE ,   NOLIDAE ,   NOCTUOIDEA
 
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Stella Crossley

Iscadia inexacta
(Photo: courtesy of Buck Richardson, Kuranda, Queensland)

This Caterpillar is white or green with long sparse hairs. There are two large black dorsal spots on each segment, as well as several smaller black spots. There are two white or yellow dorsal knobs on the first abdominal segment. The last two abdominal segments are also yellow. The caterpillar feeds on various species in EUPHORBIACEAE, including

  • Bleeding Heart ( Omalanthus populifolius ),
  • Mountain Tallow ( Sapium discolor ), and
  • Chinese Tallow ( Triadica sebifera ).

    Iscadia inexacta
    cocoon
    (Photo: courtesy of Buck Richardson, Kuranda, Queensland)

    The caterpillar pupates in a papery cocoon covered in bits of chewed leaf. The pupa is famous for being able to produce sounds when disturbed, by rubbing projections on the abdominal skin against the inner surface of the cocoon.

    Iscadia inexacta
    Photo: courtesy of Buck Richardson, from
    Tropical Queensland Wildlife from Dusk to Dawn Science and Art

    The adult moth is patchy brown, with two dark marks on the costa of each forewing. The hindwings are brown, darkening toward the margins. The moth has very hairy legs.

    The species occurs in Asia, including

  • Hong Kong,
  • Taiwan, and
  • Thailand,

    as well as in Australlia in

  • Queensland, and
  • New South Wales.


    Further reading :

    Ian F.B. Common,
    Moths of Australia, Melbourne University Press, 1990, p. 38.

    Buck Richardson,
    Tropical Queensland Wildlife from Dusk to Dawn Science and Art,
    LeapFrogOz, Kuranda, 2015, p. 172.

    Francis Walker,
    Noctuidae,
    List of the Specimens of Lepidopterous Insects in the Collection of the British Museum,
    Part 13 (1858), pp. 1102-1103, No. 1.

    Yi Wang, Lin Zhu, Xue Gu, Gregory S. Wheeler, Matthew Purcelln & Jianqing Ding,
    Pre-release assessment of Gadirtha inexacta,
    a proposed biological control agent of Chinese tallow (Triadica sebifera) in the United States

    Biological Control, 2012.


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    (written 7 November 2012, updated 22 March 2013)