Papilio palamedes

Distinguished from Papilio troilus (spicebush swallowtail) by larval host preference (Persea species vs. Lindera benzoin and Sassafras albidum) and larval morphology: P. palamedes has smaller false eyespots and smaller blue spots on abdomen. Adults differ from P. troilus in banding pattern on hindwing underside. Distinguished from Papilio cresphontes (giant swallowtail) by smaller size and different wing pattern.

Cypress swamplands, coastal swamplands, wet riparian forests, bay forests, and savannas in the southeastern United States and adjacent regions. Associated with pine flatlands containing wetland features such as bogs and bays. Requires presence of Lauraceae host plants.

Southeastern United States from southeastern Virginia southward; northeastern Mexico (represented by subspecies P. p. leontis). Range corresponds to distribution of primary host plants Persea borbonia and Persea palustris.

May to October in southeastern Virginia; March to December in more southern regions. Two to three broods per year. Chrysalis overwinters.

Larvae feed on foliage of Lauraceae: primarily Persea borbonia (redbay), Persea palustris (swampbay), and Sassafras albidum (white sassafras). Adults feed on nectar; longer proboscis enables specific plant-pollinator relationships with Platanthera ciliaris in coastal-plain habitats.

• Persea borbonia - Primary larval hostRedbay; severely impacted by laurel wilt disease
• Persea palustris - Larval hostSwampbay
• Sassafras albidum - Larval hostWhite sassafras
• Cinnamomum camphora - Potential larval hostExotic camphor tree; larvae can develop on foliage but females show no oviposition preference
• Platanthera ciliaris - Adult nectar sourceYellow fringed orchid; facilitated by long proboscis

Eggs pale greenish-yellow, laid singly on host plant leaves. Larva green with two false eyespots on thorax and blue spots on first through eighth abdominal segments; constructs leaf shelter. Green chrysalis with whitish lateral stripe edged with brown above and two horns on head; overwinters. Two to three broods per year in most of range.

Males patrol near forest edges and openings to locate females. Courtship involves male and female flying about 30 cm apart in slow unison; male then flies above and behind female to disperse pheromones until female accepts or rejects. Females show strong oviposition fidelity to native Lauraceae and do not preferentially lay eggs on exotic Cinnamomum camphora despite its suitability for larval development.

Larval herbivore on Lauraceae; contributes to nutrient cycling in wetland forest ecosystems. Adult pollinator, particularly of Platanthera ciliaris. Potential for host-switching following disturbance events affecting primary host populations.

Subject of conservation concern due to laurel wilt disease impacts on primary host Persea borbonia. Used in studies of host-plant relationships and insect-plant coevolution. Observed by naturalists in southeastern US wetland habitats.

• Papilio troilusLarva nearly identical but has larger false eyespots, larger blue spots, and different host preferences (Lindera benzoin, Sassafras albidum); in coastal Southeast, subspecies P. t. ilioneus shares Persea borbonia as host
• Papilio cresphontesLarger giant swallowtail with different wing pattern; P. palamedes appears smaller and has distinct hindwing banding

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Lewis Ocean Bay Heritage Preserve & Wildlife Management Area | Beetles In The Bush
• Potential for host shifting in Papilio palamedes following invasion of laurel wilt disease
• Differential Use of Lauraceous Hosts by Swallowtail Butterflies, Papilio troilus and P. palamedes (Papilionidae)