Eupackardia
Cockerell, 1912
Eupackardia is a in the , containing a single , Eupackardia calleta (the calleta ). The genus was erected by Theodore Dru Alison Cockerell in 1912. The sole species is notable for its striking black-and- pattern with red thoracic markings, and its possess bright aposematic coloration with chemical defenses.
Pronunciation
How to pronounce Eupackardia: //juːpækˈkɑːrdiə//
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Identification
are distinguished from other by the combination of black with post- , red thoracic collar, and relatively large size. The white lines are notably wider in females than males. The presence of triangular white spots (when present) further aids identification. are recognizable by their bright green coloration with contrasting white stripes and black with -orange bases. The is , so all individuals encountered belong to the single E. calleta.
Images
Habitat
Inhabits thorn scrub vegetation, foothills, and canyons of desert mountain ranges in arid and semi-arid regions. Associated with dry desert environments and riparian corridors within these systems.
Distribution
Mexico, Guatemala, and the southwestern United States (Arizona, New Mexico, Texas). Within Arizona, occurs in the Chiricahua Mountains, Santa Rita Mountains, and Huachuca Mountains.
Seasonality
Activity varies by region and elevation. In southeastern Arizona mountains, are present July–August. In central Arizona to Mexico, adults occur October–January. In South Texas, adults are present September–November and March–April.
Diet
feed on Fraxinus (ash), Leucophyllum frutescens (ceniza), Sapium biloculare (Mexican ), and Fouquieria splendens (ocotillo). do not feed.
Host Associations
- Fraxinus - larval ash
- Leucophyllum frutescens - larval ceniza; primary in some regions
- Sapium biloculare - larval Mexican
- Fouquieria splendens - larval ocotillo
Life Cycle
are deposited in clumps on surfaces of leaves, with females beginning to lay at dusk on the day of . emerge in the evening and may mate by early morning (as early as 7:30 am). Males are , females . Young ( 1–3) feed gregariously; older caterpillars (instars 4–5) are solitary feeders. possess integumental glands that secrete defensive chemicals. occurs in spun near the ground in shaded locations.
Behavior
exhibit in activity patterns: males are , females . display ontogenetic shift in social , feeding gregariously when young and solitarily when mature. actively spray defensive secretions from integumental glands when disturbed.
Ecological Role
function as on woody desert plants. The serves as for various ; larvae possess chemical defenses that deter most predators except certain . are subject to by raccoons, opossums, and rodents. pressure appears relatively low compared to other large , though some wasp parasitoids have been reported.
Human Relevance
have been traditionally used by Yaqui and other Indian peoples of Arizona and Mexico for ankle rattles ("tenabares" or "tenevoim") and medicinal necklaces in ceremonial contexts. The is occasionally encountered by and naturalists in its desert mountain .
Similar Taxa
- RothschildiaSimilar large with black-and- patterns, but lacks the distinctive red thoracic collar of Eupackardia and has different and pattern elements.
- EaclesRelated with large size and bold coloration, but Eacles typically display green, , or orange coloration rather than black-and- with red accents, and have different body proportions.
More Details
Conservation status
Not formally assessed; appears to be locally common within its restricted range but -specific.
Etymology
The name honors Packard, likely referring to Alpheus Spring Packard (1839–1905), an and paleontologist who contributed significantly to lepidopteran .