Pseudosphinx tetrio

Larvae are unmistakable due to aposematic coloration: velvety black body with transverse yellow rings, orange-red head capsule and legs. This color pattern distinguishes them from other sphingid larvae in the same range. Adults are less distinctive but can be recognized by gray-brown forewings with subtle patterning and relatively plain hindwings. Known host plant associations (Allamanda, Plumeria) provide additional identification context for larvae.

Tropical and subtropical regions where host plants of the family Apocynaceae occur, including gardens, forest edges, and disturbed areas with Allamanda cathartica and Plumeria species.

Tropical and subtropical Americas from the southern and southwestern United States through Central America and the Caribbean to Brazil. Records from Colombia (Barrancabermeja, Leticia, Yopal, Manizales) and widespread across Brazilian states.

Larvae feed on leaves of Apocynaceae, preferentially Allamanda cathartica and Plumeria alba. Early instars feed on upper leaf surfaces; later instars consume all leaf tissues except veins and midribs; final instars feed on entire leaves. Adults are nectar feeders (specific floral associations not documented in sources).

• Allamanda cathartica - primary larval hostApocynaceae; chemical ecology of this interaction has been studied
• Plumeria alba - primary larval hostApocynaceae

Eggs hatch in approximately 3 days. Larvae pass through 5–6 instars over 23–24 days, with gregarious behavior in first three instars and solitary or small-group feeding in later instars. Prepupal stage lasts about 4 days. Pupal stage approximately 22 days. Total development from egg to adult emergence approximately 53 days. Females lay 50–100 eggs on undersides of host leaves.

Early instar larvae are gregarious, forming colonies; later instars feed singly or in small groups. Larvae are voracious feeders, capable of consuming up to twice their body weight daily. Selective excretion of ingested plant compounds (rather than sequestration or metabolism) is a key physiological adaptation. Adults are nocturnal fliers.

Specialized herbivore of toxic Apocynaceae plants. Larval excretions contain antimicrobial compounds derived from host plants, which may mediate ecological interactions. Serves as prey for specialized predators such as the squirrel cuckoo (Piaya cayana), which has been observed to beat larvae against branches to expel gut contents before consumption.

Occasional pest in gardens and ornamental plantings of Allamanda and Plumeria. Known as "Rasta caterpillar" (chenille rasta) in Martinique due to coloration reminiscent of Rastafarian clothing. Subject of chemical ecology research due to unique excretion strategy for handling toxic host plant compounds.

• Other Sphingidae larvaeP. tetrio larvae distinguished by unique aposematic coloration (black-yellow-red rings); most other sphingid larvae in range are cryptically colored or have different warning patterns
• Other hornworms (Manduca spp.)Manduca larvae feed on Solanaceae and have diagonal lateral stripes rather than transverse rings; coloration generally green or brown, not black-yellow-red

• chemical ecology
• aposematism
• host specialization
• Apocynaceae
• selective excretion
• antimicrobial
• gregarious behavior
• tropical moth

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Phytochemical and Biological Study of Trophic Interaction between Pseudosphinx Tetrio L. Larvae and Allamanda Cathartica L.