Casbia tanaoctena Turner, 1947
Speckled Casbia
CABERINI,   ENNOMINAE,   GEOMETRIDAE,   GEOMETROIDEA
 
Don Herbison-Evans
(donherbisonevans@yahoo.com)
and
Stella Crossley

Casbia tanaoctena
early instar
(Photo: courtesy of David Akers, Won Wron, Victoria)

The caterpillars of this species are green with black spots and sparse pale hairs, and have a pale brown mark on the back of each abdominal segment. The caterpillers are missing 3 pairs of prolegs, so the caterpillars walk in a looper fashion.

Casbia tanaoctena
late instar
(Photo: courtesy of David Akers, Won Wron, Victoria)

The caterpillars have been found feeding on

  • Hazel Pomaderris (Pomaderris aspera, RHAMNACEAE).

    Casbia tanaoctena
    head, close up
    (Photo: courtesy of David Akers, Won Wron, Victoria)

    The caterpillars grow to a lenth of about 2.5 cms. They pupate in a sparse cocoon in a dead leaf. The pupa is brown with a greenish body, with a length of about 1 cm.

    Casbia tanaoctena
    pupa
    (Photo: courtesy of David Akers, Won Wron, Victoria)

    The moths of are pale brown with the wings crossed by several wiggly indistinct darker brown arcs containing even darker spots. There are often three prominent black spots on each forewing, sometimes expanded by an extra brown mark into a trident shape. The thorax has a little happy face on it. The wingspan is about 2 cms.

    Casbia tanaoctena
    male
    (Photo: courtesy of Cathy Powers, Brisbane Ranges, Victoria)

    The females are inclined to have fainter markings than the males.

    Casbia tanaoctena
    female
    (Photo: courtesy of Cathy Powers, Brisbane Ranges, Victoria)

    The species occurs in

  • New South Wales,
  • Australian Capital Territory,
  • Victoria.

    Casbia tanaoctena
    underside
    (Photo: courtesy of John Bromilow, Ainslie, Australian Capital Territory)


    Further reading :

    Marilyn Hewish,
    Moths of Victoria: Part 7,
    Bark Moths and Allies - GEOMETROIDEA (A)
    ,
    Entomological Society of Victoria, 2016, pp. 14-15.

    A. Jefferis Turner,
    New Australian species of Boarmiadae (Lepidoptera),
    Proceedings of the Royal Society of Queensland,
    Volume 58 (1947), p. 97, No. 62.


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    (written 1 January 2017, updated 18 December 2021)