Hemileucinae

Buck and Io Moths

Hemileucinae is a of containing approximately 630 to North and South America. The subfamily is characterized by bearing venomous urticating or , with some species capable of causing severe medical reactions in humans. Notable include Lonomia, whose can cause life-threatening envenomation, and Automeris, known for their striking patterns. are typically to large with reduced or non-functional mouthparts.

Hylesia by no rights reserved, uploaded by Dario Taraborelli. Used under a CC0 license.

Automeris cecrops by (c) Jeremiah Degenhardt, some rights reserved (CC BY), uploaded by Jeremiah Degenhardt. Used under a CC-BY license.

Automeris cecrops by (c) Adriana Nelly Correa Sandoval, some rights reserved (CC BY), uploaded by Adriana Nelly Correa Sandoval. Used under a CC-BY license.

Pronunciation

How to pronounce Hemileucinae: /ˌhɛmɪljuːˈsɪniː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other by the combination of: (1) presence of urticating or in , (2) New World distribution (North and South America only), and (3) with reduced mouthparts. Within Saturniidae, differs from Saturniinae (giant ) by generally smaller size and different larval spine ; from Cercophaninae by geographic restriction to the Americas. -level identification relies on pattern, morphology, and larval characteristics.

Images

Habitat

Diverse across the Americas including tropical and subtropical forests, montane grasslands, and temperate woodlands. Specific habitat associations vary by ; some show affinity for particular such as pine forests (Hispaniodirphia) or grasslands (Leucanella).

Distribution

to North and South America; approximately 630 distributed across the continents. Notable regional endemics include Hispaniodirphia in the Greater Antilles (only documented from this region).

Seasonality

Varies by and latitude. Some species exhibit facultative pupal enabling or under favorable conditions (e.g., Dirphia dolosa in southern Brazil). Tropical species may breed continuously.

Host Associations

Ligustrum ovalifolium - laboratory Accepted by Lonomia electra in captivity
Psidium guajava - laboratory Accepted by Hylesia metapyrrha; unknown
Schizolobium parahyba - of Automeris jucunda in Colombia
Rubus fruticosus - laboratory Replacement for Automeris jucunda
Diospyros khaki - laboratory Accepted by Periga circumstans; prolonged larval development compared to alternative
Ilex paraguariensis - laboratory Accepted by Periga circumstans
Anacardium occidentale - of Dirphia moderata; considered potential defoliator pest of cashew
Pennisetum clandestinum - grass used by Meroleuca (Meroleucoides) dargei in Colombia
Solanum lycocarpum - of Leucanella memusae in Brazilian mountain grasslands
Pinus - supposed association of Hispaniodirphia spp. suspected to associate with pine trees; unconfirmed

Life Cycle

with variable development times. stage: 15–52 days depending on and conditions. Larval stage: 5–7 , duration 6–12+ weeks; are gregarious in many species. Pre-pupal stage: approximately 8–9 days. Pupal stage: 50–60 days; females often larger and longer-developing than males. stage: short-lived, 5–6 days average, non-feeding. Total development from egg to adult: approximately 120–191 days under laboratory conditions.

Behavior

of many exhibit , traveling and feeding in groups (documented in Lonomia electra, Hylesia metapyrrha, Automeris jucunda, Dirphia dolosa). This social increases risk of severe envenomation when humans contact large congregations. females of some (e.g., Hylesia) possess easily detachable urticating abdominal hairs.

Ecological Role

function as ; some are potential defoliator pests of economically important (e.g., Dirphia moderata on cashew). Medical importance due to venomous larvae creates human-wildlife conflict in affected regions.

Human Relevance

Medical significance due to larval envenomation. Lonomia cause severe accidents: L. obliqua and L. achelous produce hemotoxins causing disseminated intravascular coagulation and hemorrhagic , potentially fatal. Other cause erucism (skin irritation from urticating ). females of Hylesia cause lepidopterism (allergic reactions from airborne /hairs). toxins have potential medical applications as anticoagulants.

Similar Taxa

SaturniinaeAlso in but distinguished by generally larger size, different larval , and distribution including Old World
CercophaninaeAlso in but restricted to southern South America and Australia; lacks the characteristic larval urticating of Hemileucinae
ArsenurinaeNeotropical with large size but different and larval characteristics

More Details

Medical Research Potential

The potent blood-thinning properties of Lonomia have attracted laboratory research interest for potential medical applications in anticoagulant development.

Taxonomic Uncertainty

The systematic position of the Antillean Hispaniodirphia within Hemileucinae remains unresolved.