Papilio aristodemus

Distinguished from the giant swallowtail (Papilio cresphontes) by absence of the small red patch within the blue band on the underside of the hindwing. The rusty ventral patch and specific yellow banding pattern on forewings are diagnostic. Sexes separable by antennae coloration: males have black antennae with yellow terminal knob, females have uniformly black antennae.

Tropical hardwood hammocks in southern Florida and the West Indies. In Florida, historically occupied tropical hardwood hammock from South Miami to Lower Matecumbe Key, now restricted to Florida Keys islands. Prefers areas with dappled sunlight penetrating canopy. In the Keys, occurs at relatively high elevation (3.0–4.6 m above sea level), avoiding tidal zones.

United States: southern tip of Florida (currently restricted to Florida Keys, primarily Biscayne National Park islands and Key Largo). West Indies: Hispaniola (Dominican Republic and Haiti), Cuba, Cayman Islands, possibly Puerto Rico. Bahamas: Great Inagua, Crooked Island, Acklins Islands.

Single annual flight season with adults active primarily May–June; most sightings between mid-April and mid-July. Some adults observed in late July and early September. Adult emergence triggered by rainfall. Diurnal activity from approximately 7 am to 7 pm.

Adults: nectar from guava (preferred exotic source), cheese shrub, hibiscus, wild coffee; will travel considerable distances for blooming guava. Larvae: host plants in Rutaceae including hoptree (Ptelea trifoliata), citrus species, sea torchwood (Amyris elemifera), lime prickly-ash (Zanthoxylum fagara); wild lime (Zanthoxylum fagara) specifically mentioned for oviposition.

Single generation per year (univoltine). Eggs laid April–June on wild lime; hatch in up to 10 days. Larvae mature in 3–4 weeks, reaching up to 76 mm. Pupation occurs in chrysalis; adults emerge following spring, triggered by rainfall. Some individuals remain dormant in chrysalis for up to two years.

Territorial; males patrol females and investigate intruding butterflies. Males patrol tree canopies up to 3 m height on hot afternoons and linger in open areas seeking females. Flight rapid and unpredictable, typically 1–2 m above ground. Highly maneuverable within hardwood hammocks, navigating branches and spider webs. Capable of sustained flight across open water; observed crossing 360 m between islands. Maximum daily movement documented at 9.3 km.

Pollinator; adults transfer pollen while nectaring. Larvae function as herbivores on Rutaceae vegetation. Serves as indicator species for tropical hardwood hammock ecosystem health. Prey for birds, lizards, and spiders.

Flagship species for conservation of tropical hardwood hammock ecosystems in Florida. Subject of intensive captive breeding program at University of Florida McGuire Center following near-extinction from Hurricane Andrew (1992). Florida subspecies (ponceana) federally listed as endangered in 1984. Named in honor of entomologist William Schaus.

• Papilio cresphontes (giant swallowtail)Overlapping range and similar size; distinguished by presence of small red patch within blue band on ventral hindwing, which P. aristodemus lacks
• Heraclides ponceana (formerly P. a. ponceana)Florida subspecies elevated to species status in 2020; now considered distinct taxon, though historically treated as conspecific

• endangered
• flagship species
• tropical hardwood hammock
• single generation
• captivity breeding
• West Indies
• Florida endemic
• Rutaceae specialist
• territorial behavior
• cross-water dispersal

• BugGuide
• Wikipedia
• GBIF taxonomy match
• NCBI Taxonomy
• Catalogue of Life
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