Acharia

Thunberg, 1794

Saddleback Caterpillar Moths and Allies

Acharia is a of in the , commonly known as saddleback moths. The genus is notable for with urticating (stinging) hairs and distinctive saddleback patterning. Some , particularly Acharia stimulea, are well-known in North America for their painful . Other species such as Acharia fusca have become agricultural pests in palm plantations.

Acharia by (c) Andy Reago & Chrissy McClarren, some rights reserved (CC BY). Used under a CC-BY license.

Acharia by no rights reserved, uploaded by Zygy. Used under a CC0 license.

Acharia extensa by (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist. Used under a CC-BY license.

Pronunciation

How to pronounce Acharia: //əˈkɛəriə//

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Identification

are immediately recognizable by the prominent -like marking on the —a or purplish shield surrounded by a cream or border. The body is -like with reduced , typical of . Four large, fleshy () bearing venomous project from the and rear flanks. are relatively nondescript brown or gray with subtle patterning.

Images

Habitat

Found in forests, gardens, and agricultural settings. occur on foliage of diverse plants. Some thrive in disturbed and suburban gardens.

Distribution

to the Americas, with Acharia stimulea widespread in eastern North America. Acharia fusca has expanded as an pest in palm-growing regions of Southeast Asia and elsewhere.

Seasonality

active primarily in summer and autumn. present during growing seasons when plants are available.

Diet

feed on leaves of diverse plants including oaks, elms, lindens, apples, plums, corn, blueberries, , and iris. Acharia fusca specializes on palm (Elaeis guineensis).

Life Cycle

with , larval, pupal, and stages. are the most commonly encountered stage. Development time from egg to adult ranges from approximately 77 days at 35°C to 170 days at 15°C in Acharia fusca. occurs in a , with adults emerging to mate and lay eggs.

Behavior

exhibit defensive when disturbed, turning toward threats and engaging with urticating on their . They are solitary feeders. When parasitized by (Cotesia), larvae become for wasp larvae that emerge and spin external .

Ecological Role

function as , consuming leaf tissue of various plants. They serve as for including Cotesia . Their stinging defenses represent aposematic (warning) coloration against vertebrate .

Human Relevance

Acharia stimulea is familiar to gardeners and outdoor in North America due to its painful , which causes burning sensations, rash, and in severe cases reactions. Acharia fusca is an economically significant pest of palm plantations, causing and yield loss.

Similar Taxa

Limacodidae (other genera)Other share the reduced , -like larval form, but Acharia is distinguished by the distinctive saddleback color pattern and specific arrangement of .
Saturniidae larvaeSome also bear , but they possess more pairs of (five versus two in ) and lack the saddleback marking.