Idiodes siculoides (Walker, 1860)
(previously known as Choara siculoides)
Straight-winged Bracken Moth
LITHININI ,   ENNOMINAE ,   GEOMETRIDAE ,   GEOMETROIDEA
 
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Cathy Young & Stella Crossley

Idiodes siculoides
(Photo: courtesy of Cathy Young, Claremont, Tasmania, Moths of Victoria: Part 7)

These Caterpillars are loopers, having only 4 prolegs. They are brown with a light and dark markings.

Idiodes siculoides
(Photo: courtesy of Cathy Young, Claremont, Tasmania, Moths of Victoria: Part 7)

The caterpillarsfeed on :

  • Bracken ( Pteridium esculentum, POLYPODIOPHYTA ).

    Idiodes siculoides
    (Photo: courtesy of Donald Hobern, Aranda, Australian Capital Territory)

    The adult moth of this species is brown with varied marking markings often including a line or line of dots from the wingtip to midway along the inner margin on each forewing, and a similar submarginal line on the each hindwing. The forewings have hooktips. The wingspan is about 4 cms.

    The adult moths can be distinguished from those of the similar species Idiodes apicata by the white transverse line on top of the head joining the antennae.

    The eggs are spherical and covered in a fine embossed honeycomb pattern. Initially they are white, darkening through pink as hatching approaches.

    Idiodes siculoides
    eggs, magnified
    (Photo: copyright Cathy Young, Claremont, Tasmania)

    The species occurs over much of Australia, including:

  • New South Wales,
  • Australian Capital Territory,
  • Victoria,
  • Tasmania, and
  • South Australia.


    Further reading :

    Marilyn Hewish,
    Moths of Victoria: Part 7,
    Bark Moths and Allies - GEOMETROIDEA (D)
    ,
    Entomological Society of Victoria, 2016, pp. 6-9.

    Francis Walker,
    Geometrites,
    List of the Specimens of Lepidopterous Insects in the Collection of the British Museum,
    Part 21 (1860), p. 291, No. 1.


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    (updated 25 October 2010, 8 October 2013, 17 June 2016)