Caterpillars of the World - Colombia

King Page Swallowtail

Heraclides thoas  LINNAEUS, 1771


subfamily - PAPILIONINAE


Heraclides thoas, Rio Claro, Colombia Adrian Hoskins

The subfamily Papilioninae comprises of about 550 species of worldwide distribution, and includes the Swallowtails, and the Dragontails and giant Birdwings of south-east Asia.
Heraclides thoas is distributed from Mexico to Bolivia and Argentina, and occurs as a rare stray in the southern United States.
This species is migratory in nature and found in many different habitats including tropical rainforest, cloudforest, humid deciduous forest, orchards and suburban zones at altitudes between sea level and about 1600m.
The eggs are laid singly on leaves and stems of the larval foodplants, or on nearby plants, along forest edges, roadsides and riverbanks. The larvae feed primarily on Piper, but also possibly on Zanthoxylum, Citrus and Ptelea, although larvae found on these plants are more likely to be the very closely related cresphontes.
The young thoas larva is dull in colour, and similar in appearance to a bird dropping. In common with other Papilionidae larvae it is equipped with an extrusible forked appendage - the osmaterium, which is situated behind the head. This is everted if the larva is molested, and gives off a noxious pheromone containing isobutyric acid, which is believed to be used as a defence against ants.
When fully grown the larva loses the warty tubercules and becomes pale green, with extensive areas of white on the thoracic and anal segments.

The adult is black, marked with broken bands of cream, and has fluted tails on the hindwings. It is extremely similar in appearance to Heraclides cresphontes, and can only be distinguished from it with certainty by examination of the abdominal tip. H. cresphontes however has a more northerly distribution being found from Canada to Colombia.

Heraclides thoas, Satipo, Peru Adrian Hoskins



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