Common Grass Blue
(often known as Zizina labradus)
POLYOMMATINI, POLYOMMATINAE, LYCAENIDAE, PAPILIONOIDEA
(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.
The caterpillars rest by day at the base of the foodplant, and feed nocturnally on various members of FABACEAE, such as:
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.
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.
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.
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.
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.
The species is found over most of Australia, including:
The subspecies labdalon Waterhouse & Lyell, 1914, occurs on
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,
Issue 72 (March 2014), pp. 18-26,
Butterflies and Other Invertebrates Club.
Johan Christian Fabricius,
Classi VI. Glossata,
Volume 2 (1787), p. 73, No. 689.
(updated 1 May 2010, 9 February 2018, 10 March 2020)