Graphium sarpedon (Linnaeus, 1758)
Blue Triangle or Common Bluebottle
(one synonym : Chlorises helena Swainson, 1851)
Don Herbison-Evans
Stella Crossley

Graphium sarpedon
early instar, magnified

This species is probably named after one of the kings of Lycia in Ancient Greek mythology.

The caterpillars at first are dark grey and hairy, with a pale yellow tail. As they grow they become green with a humped thorax, tapering from the thorax rearward. The yellow tail develops into a pair of white spikes. Paired dark blue spikes also develop on each of the three thorax segments.

Graphium sarpedon
later instar
(Photo: courtesy of Rosemary Robins, Eureka, New South Wales)

The caterpillar is often found on the introduced

  • Camphor Laurel ( Cinnamomum camphora, LAURACEAE ),

    although its other food plants include Australian natives in LAURACEAE such as:

  • Blush Walnut ( Beilschmiedia obtusifolia ),
  • Oliver's Sassafras ( Cinnamomum oliveri ),
  • Three veined Cryptocarya ( Cryptocarya triplinervis ),
  • Steelbutt ( Endiandra impressicosta ),
  • Bolly ( Litsea reticulata ), and
  • White Bolly Gum ( Neolitsea dealbata ),

    as well as plants in other families such as

  • Grey Sassafras ( Doryphora aromatica, MONIMIACEAE ),
  • Glasswood ( Geijera salicifolia, RUTACEAE ),
  • Coondoo ( Planchonella laurifolia, SAPOTACEAE ).

    Graphium sarpedon
    (Photo: courtesy of Tim Waugh, Uki, New South Wales)

    The spikes on the metathorax become longer than the others, and connected by a conspicuous yellow bar. The sides of a mature caterpillar are marked by a whitish line just above the legs. The caterpillar grows to a length of about 3 cms.

    Graphium sarpedon
    (Photo: copyright Lyn Finn, Hunter Region School of Photography in Newcastle,
    Macquarie Hills, New South Wales)

    When it is disturbed, the caterpillar often rears up on its rear legs. It may also extrude a pair of pale translucent yellow or green fleshy horns ( an osmeterium) from a dorsal pocket in the prothorax, just behind the head. These smell strongly of camphor, and are retracted quickly after a second or two.

    Graphium sarpedon
    (Photo: courtesy of the Macleay Museum, University of Sydney)

    The caterpillar pupates on the underside of a curled leaf of the food plant. The pupa is green with a few yellow lines that converge to a spike on its head. The pupa is held by a silk girdle around the middle, and a cremaster at the tail.

    Graphium sarpedon
    (Photo: courtesy of the Macleay Museum, University of Sydney)

    Within three weeks in summer, the adult emerges, having a wing span around 7 cms.

    Graphium sarpedon
    (Photo: courtesy of Rosemary Robins, Eureka, New South Wales)

    The wings are black above and brown below, with large turquoise patches in the middle of both fore and hind wings. These patches seem to form a triangle, with the apex pointing towards the body.

    Graphium sarpedon
    (Photo: courtesy of Todd Burrows, South Stradbroke Island)

    The underside of the wings are similarly marked with turquoise patches, and each hind wing has some red dots on its underside.

    Specimens reared in captivity are usually smaller and not as blue as wild forms. The reason for this is unclear: perhaps sunlight is necessary for maximum growth and full pigment development.

    Graphium sarpedon
    (Photo: courtesy of Di Donovan, Beecroft, New South Wales)

    The eggs are white and spherical, laid singly. The female butterfly is quite particular, usually only laying her eggs on a food plant. Occasionally however she makes a mistake, and we have found the eggs on

  • Avocado ( Persea americana, LAURACEAE ),

    on which the young caterpillars cannot always successfully develop.

    Graphium sarpedon egg

    The species is found as several subspecies all over south-east Asia, including :

  • China,
  • Japan,
  • Papua,
  • Singapore, and
  • Thailand,

    as well choredon (Felder & Felder, 1864) on the eastern tropical and subtropical seaboard of Australia, including:

  • Brisbane, Queensland, and
  • Sydney, New South Wales.

    Graphium sarpedon
    mating pair
    (Photo: courtesy of Nick Monaghan, Tewantin, Queensland)

    This species is featured at Coffs Harbour Butterfly House. Butterflies of this species may be purchased for release at weddings etc.

    Graphium sarpedon
    Hong Kong 1979
    Graphium sarpedon
    Solomon Islands 1982

    Further reading :

    Michael F. Braby,
    Butterflies of Australia,
    CSIRO Publishing, Melbourne 2000, vol. 1, pp. 259-260.

    Frank Jordan & Helen Schwencke,
    Create More Butterflies : a guide to 48 butterflies and their host-plants
    Earthling Enterprises, Brisbane, 2005, p. 7.

    Carl Linnaeus,
    Insecta Lepidoptera,
    Systema Naturae,
    Volume 1, Edition 10 (1760), Class 5, Part 3, p. 461, No. 14.

    Australian Butterflies
    Australian Moths

    (updated 15 March 2013, 12 May 2015)