Zizina otis Fabricius, 1757
Common Grass Blue
(often known as Zizina labradus)
POLYOMMATINI,   POLYOMMATINAE,   LYCAENIDAE,   PAPILIONOIDEA
  
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Stella Crossley

Zizina otis
(Photo courtesy of Harold McQueen, Goodna, Queensland)

These caterpillars are green slug-like creatures, with short pale hairs, and a dark green stripe along the back, and a thin yellowish stripe along each side of the body. The head is brown or black, although it normally cannot be seen, as the caterpillar holds it tucked under the thorax.

Zizina otis
(Photo courtesy of Harold McQueen, Goodna, Queensland)

The caterpillars rest by day at the base of the foodplant, and feed nocturnally on various members of FABACEAE, such as:

  • Emu Foot ( Cullen tenax ),
  • Australian Indigo ( Indigofera australis ),
  • Lucerne ( Medicago sativa ),
  • Glycine ( Neonotonia wightii ),
  • Romano Beans ( Phaseolus coccineus ),
  • Garden Peas ( Pisum sativum ), and
  • Clover ( Trifolium species).

    Zizina otis
    oops: the girdle broke
    (Photo courtesy of Harold McQueen, Goodna, Queensland)

    The caterpillars grow to a length of 1 cm. The pupa is dirty pink, pale green, or pale yellow, with variable dark markings. The pupa is attached to a convenient surface by cremaster and girdle. The pupa has a length of about 1 cm.

    Zizina otis
    female
    (Photo: courtesy of Edwin Vella, Yarramundi, New South Wales)

    The female adult has a black body, and the upper surfaces of the wings are dark brown, with a purplish blue sheen around the bases.

    Zizina otis
    male
    (Specimen: courtesy of the Macleay Museum, University of Sydney)

    The male adult has a black body, and the upper surfaces of the wings are purplish blue except for a black edge to each margin.

    Zizina otis
    close-up, showing white spot on the antenna club
    (Photo: courtesy of Harold McQueen, Goodna, Queensland)

    The butterflies have an interesting white spot on the club of the antenna. They normally fly very close to the ground. The undersides are greyish blue with a fawn pattern of spots and stripes.

    Zizina otis
    mating pair
    (Photo: courtesy of Tony Rodd)

    The bluish toroidal eggs are laid singly on the leaves of a foodplant. In summer in Melbourne, eggs that we collected hatched in three days from being laid.

    Zizina otis
    egg under a clover leaf
    (Photo: Don Herbison-Evans, Sydney, New South Wales)

    The species is found over most of Australia, including:

  • Queensland,
  • Lord Howe Island,
  • New South Wales,
  • Victoria,
  • Tasmania,
  • South Australia, and
  • Western Australia.

    The subspecies labdalon Waterhouse & Lyell, 1914, occurs on

  • Cape York.

    Zizina otis
    underside
    (Photo: courtesy of Trevor Jinks, North Burnett, Queensland)


    Further reading :

    Michael F. Braby,
    Butterflies of Australia, CSIRO Publishing, Melbourne 2000, vol. 2, pp. 837-838.

    Kelvyn L. Dunn,
    New and overlooked distribution records for the Common Grass Bluee, Zizina otis labradus (Godart) (Lepidoptera: Lycaenidae), in eastern Australia,
    Metamorphosis Australia,
    Issue 72 (March 2014), pp. 18-26,
    Butterflies and Other Invertebrates Club.

    Johan Christian Fabricius,
    Classi VI. Glossata,
    Mantisssa Insectorum,
    Volume 2 (1787), p. 73, No. 689.


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    (updated 1 May 2010, 9 February 2018, 10 March 2020)