Description: It is a medium to large-sized moth belonging to the family Saturniidae, notable both for its discreet appearance and for the medical relevance of its larvae. Adults display dark-colored wings, ranging from grayish-brown to nearly black, with subtle patterns that enhance camouflage. A clear sexual dimorphism is present, with females being significantly larger and heavier than males. The body is densely covered with hairs, particularly on the abdomen, where females carry microscopic urticating setae capable of causing skin reactions in humans.

Geographic distribution: This species is widely distributed across South America, with confirmed records in Argentina, Uruguay, Paraguay, southern Brazil, and parts of Bolivia. In Argentina, it is especially common in the central and northern regions, including urban and suburban areas. Its distribution closely follows the availability of suitable host plants and favorable climatic conditions.

Habitat: It occupies a broad range of environments, from native forests and riparian woodlands to urban parks, gardens, roadside trees, and rural landscapes. The species shows a strong ability to adapt to human-modified environments, which explains its frequent proximity to populated areas. Arboreal vegetation is essential for the completion of its life cycle.

Feeding: Larvae are strictly herbivorous, feeding on the leaves of numerous plant species, both native and introduced. Host plants often include trees commonly used in urban landscaping. Adults, however, do not feed, as they have reduced mouthparts and rely entirely on energy reserves accumulated during the larval stage.

Behavior: Adults exhibit nocturnal activity and are strongly attracted to artificial lights, often leading them into human dwellings. Larvae are gregarious, particularly during early instars, forming dense clusters on trunks and branches. Contact with larval urticating hairs can cause skin inflammation, eye irritation, and respiratory discomfort, a condition known as lepidopterism.

Reproduction: Reproduction is oviparous. Females lay large egg masses on branches or trunks and cover them with abdominal urticating hairs, providing effective protection against predators. After hatching, larvae pass through several developmental stages before pupation. Pupae are usually formed in the soil or among leaf litter, completing the cycle with the emergence of the adult moth.

Conservation status: The species is not currently listed under any global threat category. However, due to its public health implications and periodic population outbreaks, it is subject to monitoring and control programs in several regions. Conservation efforts focus more on population management than on species protection.

Author of this compilation: EcoRegistros – 01/18/2026