Papilio rutulus

Papilio rutulus
	Papilio rutulus. Dorsal view
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Papilionidae
Genus:	Papilio
Species:	P. rutulus
Binomial name
	Papilio rutulus; H. Lucas, 1852

Papilio rutulus, the western tiger swallowtail, is a

Papilionidae family. The species was first described by Hippolyte Lucas

in 1852.

Like the other tiger swallowtails, the western tiger swallowtail was formerly classified in genus Pterourus, but modern classifications all agree in placing them within Papilio.

Distribution

This common species is present in western North America. The normal range of the western tiger swallowtail covers much of western North America, from British Columbia to North Dakota in the north to Baja California and New Mexico in the south. Individuals occasionally turn up east of this range; in eastern North America, though, it is replaced by the similar eastern tiger swallowtail, Papilio glaucus.

Habitat

These butterflies are frequently seen in urban parks and gardens, as well as in rural woodlands and

riparian

areas.

Description

Papilio rutulus can reach a wingspan of 7 to 10 cm (3 to 4 in). These large butterflies are brightly colored. The wings are yellow with black stripes and blue and orange spots near their tail. They have the "tails" on the hindwings that are often found in swallowtails.

Young caterpillars resemble bird droppings, and as they molt, they eventually turn bright green, with a pair of large yellow

chrysalis

is green in summer and dark brown in winter, and looks like a piece of wood.

Biology

Butterflies emerge from winter chrysalids between February and May, the date depending on the temperature, so they are seen earlier in the more southerly and more coastal parts of their range. They are very active butterflies, rarely seen at rest. The adult females lay up to a hundred eggs in total. The eggs are deep green, shiny, and spherical. They are laid singly, on the undersides of leaves.

The

quaking aspen

, and many others.

The caterpillars molt five times, eventually reaching a length up to 5 cm before pupating. In summer, the butterfly can emerge as quickly as 15 days after the caterpillar pupated, but when the caterpillar pupates in the fall, the butterfly does not emerge until the spring.

The males often congregate, along with other species of swallowtail, at pools and along streams and rivers; they drink from the water and mud, extracting minerals, as well as moisture.

Gallery

Caterpillar, pre-pupal state
Caterpillar extending osmeterium
Adult of P. rutulus on Prunus serrulata
Video clip

References