Scopula perlata (Walker, 1861)
Cream Wave
(one synonym : Acidalia recessata Walker, 1861)
STERRHINAE ,   GEOMETRIDAE ,   GEOMETROIDEA
 
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Stella Crossley

Scopula perlata

The body of this Caterpillar is long and thin. When resting, it stands erect, but with a bend and twist in the front half of the body. A group of these Caterpillars standing side by side on their food plant look like a minature of the entwined snakes that were reputed to form Medusa's hair. The Caterpillar is fawn with small lateral dots each side near the front of the abdomen. Early instars are striped, but the stripes are absent in later instars. It is a looper, with only one pair of ventral prolegs. The Caterpillars have been found on:

  • Begonia ( Begonia, BEGONIACEAE ).

    The Caterpillars grow to a length of about 2 cms.

    They pupate in the leaf litter.

    Scopula perlata
    (Photo: courtesy of Merlin Crossley)

    The adult moths range in colour from pale green to yellow.

    Scopula perlata
    (Photo: courtesy of Cathy Young)

    Each wing has a small black discal spot. Each wing is traversed by brown lines, with the inner one wider than the others. When at rest, the moths hold their wings outspread so that these transverse lines continue unbroken across all four wings. They have a wing span of about 2 cms.

    Scopula perlata
    eggs, magnified
    (Photo: courtesy of Cathy Young)

    In captivity, an adult female laid rows of white eggs on the flat surface of a Wattle phyllode (which was odd as the Caterpillars refused to eat it). Each egg was twice as high as it was wide and had microscopic corrugated ribs. The eggs were spaced so that they did not touch each other. As they approached hatching, they developed red spots.

    The species has been taken in:

  • Indonesia,

    and also in Australia in

  • Queensland,
  • New South Wales,
  • Victoria,
  • Tasmania, and
  • South Australia.


    Further reading:

    Peter Marriott,
    Moths of Victoria: Part 3 - Waves & Carpets - GEOMETROIDEA (C),
    Entomological Society of Victoria, 2011, pp. 6-9.


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    (updated 11 November 2013)