Chrysolarentia decisaria (Walker, 1863)
Grassland or Tunbridge Looper
(one synonym is: Camptogramma monacmaria Mabille, 1897)
XANTHORHOINI,   LARENTIINAE,   GEOMETRIDAE,   GEOMETROIDEA
 
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Cathy Young & Stella Crossley

These Caterpillars are threatened with extinction. They feed in native pastures on herbaceous plants that such as :

  • Australian Native Geranium ( Pelargonium rodneyanum, GERANIACEAE ), and
  • Tunbridge Buttercup ( Ranunculus prasinus, RANUNCULACEAE ).

    The caterpillars are brown with a broad pale dorsal stripe, and a similar stripe each side. It has short sparse hairs, each arising from a darker brown spot.

    Chrysolarentia decisaria
    (Photo: copyright Cathy Young)

    Since the nineteenth century the species has been in decline. This is probably due to:

  • the advent of sheep which also feed on the foodplants of the caterpillar,
  • the introduction of new forage plants which have displaced these foodplants, and
  • the fertilisation of the pastures which gives advantages to other plants.

    The species is now considered to be threatened.

    Chrysolarentia decisaria
    (Photo: courtesy of Peter Marriott, Moths of Victoria: Part 3)

    The adult moths have brown wings with wavy pale bands across them. The wingspan is about 2 cms.

    The species has been found in

  • Victoria, and
  • Tasmania.


    Further reading:

    Peter Marriott,
    Moths of Victoria: Part 3,
    Waves & Carpets - GEOMETROIDEA (C)
    ,
    Entomological Society of Victoria, 2011, pp. 20-21.

    Francis Walker,
    Geometrites,
    List of the Specimens of Lepidopterous Insects in the Collection of the British Museum,
    Part 26 (1863), p. 1671, Pg. 1088.


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    (updated 2 March 2013)