Osmeterium
Guides
Battus
Pipevine Swallowtails and Allies
Battus is a New World genus of swallowtail butterflies in the family Papilionidae. The genus comprises approximately 9 species distributed across the Americas, with the most well-known North American representatives being Battus philenor (pipevine swallowtail) and Battus polydamas (Polydamas swallowtail). All members share a specialized ecological relationship with pipevine plants (Aristolochia), which serve as their exclusive larval host plants. The genus is notable for its aposematic coloration and chemical defense system derived from sequestered toxins.
Battus polydamas lucayus
Florida Polydamas Swallowtail, Polydamas Swallowtail, Gold Rim, Tailless Swallowtail
A tailless swallowtail butterfly distinguished by gold-rimmed black wings with red spots. Larvae feed exclusively on pipevine plants (Aristolochia) and sequester toxic aristolochic acids for chemical defense, rendering both caterpillars and adults unpalatable to vertebrate predators. Adults exhibit slow, weak flight and are active pollinators.
Battus polydamas polydamas
Polydamas Swallowtail, Gold Rim Swallowtail, Tailless Swallowtail
The Polydamas swallowtail is a tailless swallowtail butterfly distinguished by its black wings with red or pink spots and a characteristic gold band along the wing margins. Adults are active year-round in tropical regions and are notable for their complete lack of tail-like extensions on the hindwings—a unique trait among New World swallowtails. The species serves as a model for Batesian mimicry, with its aposematic coloration warning predators of its chemical defenses derived from toxic host plants.
Papilio polyxenes
Black Swallowtail, Eastern Black Swallowtail, American Swallowtail, Parsnip Swallowtail, Parsleyworm (caterpillar)
Papilio polyxenes, the black swallowtail, is a medium-sized butterfly native to North America. Adults are recognized by black wings with yellow spots and blue scaling, with females exhibiting more extensive blue areas and effective Batesian mimicry of the toxic pipevine swallowtail. The species employs a lek mating system where males defend hilltop territories and engage in aggressive aerial combat. Caterpillars feed on plants in the carrot family (Apiaceae) and possess a distinctive orange forked gland (osmeterium) that everts to release foul-smelling compounds when threatened.
Papilio zelicaon nitra
Papilio zelicaon nitra is a subspecies of the anise swallowtail, a western North American butterfly in the family Papilionidae. The parent species Papilio zelicaon is well-documented as having larvae that resemble bird droppings, providing camouflage from predators. When disturbed, the caterpillar extends its osmeterium, a forked scent gland that releases a strong odor as a defensive mechanism. This subspecies is part of a group showing complex life cycle adaptations including non-diapause overwintering strategies in some populations.
Papilio zelicaon zelicaon
Anise Swallowtail
The nominate subspecies of the Anise Swallowtail, found in western North America. Larvae possess distinctive defensive osmeteria—scent glands that evert when disturbed, releasing foul-smelling compounds. The species has been extensively studied for diapause dynamics and host plant relationships, with research demonstrating Type III diapause-induction curves. Laboratory life table studies have been conducted to test survivorship hypotheses across its elevational range.