Aglossa caprealis

Distinguished from other small pyralid moths by combination of size (23–27 mm wingspan), dull uniform coloration, and association with stored products or decaying organic matter. Similar species in genus Aglossa require genitalia examination or molecular analysis for reliable separation. Adults may be confused with other stored product pyralids such as Pyralis farinalis, but A. caprealis tends to have narrower, more elongate forewings.

Small moth with wingspan 23–27 mm. Forewings relatively narrow, typically with dull brownish or grayish coloration. Hindwings paler, more translucent. Body slender, with long antennae. Resting posture with wings folded tent-like over body.

Strongly associated with human-modified environments: grain storage facilities, barns, stables, and areas with accumulated dry organic debris. Larval habitat includes stored grain, hay, straw, and decaying manure piles. Has been observed in caves and other dark, humid situations with organic accumulation.

Cosmopolitan distribution due to human transport; presumed native to western Palearctic or nearby western Eurasian regions. Established populations documented across Europe, North America, and other continents. GBIF records include Azorean islands (Faial, Graciosa, Pico, São Miguel, Santa Maria).

Adult flight period June to August in temperate regions; timing varies with latitude and local climate. Multiple generations per year possible in favorable conditions, with activity potentially extending beyond core summer months in warmer climates or heated storage environments.

Larvae feed on dry plant waste, grain (including maize), hay, and straw. Also consume decaying manure. Documented consumption of animal-derived materials including carcasses, suet, lard, and pork rinds. This broad diet, spanning plant and animal matter, is unusual among pyralid moths.

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae develop within or upon food substrate; pupation occurs in silken cocoon within food material or nearby crevices. Generation time variable depending on temperature and food quality; multiple generations annually under optimal conditions.

Nocturnal adult activity. Larvae are scavengers, feeding within or upon accumulated organic substrates. Tendency to inhabit dark, undisturbed locations with food accumulation. Adults attracted to light.

Decomposer and scavenger in both natural and anthropogenic environments. Contributes to breakdown of dry plant matter and decaying organic material. In stored product ecosystems, functions as pest and decomposer simultaneously.

Significant pest of stored grain and dry stored products. Larval feeding reduces food quality and contaminates products with frass and silk. Economic impact in agriculture and food storage industries. Unusual dietary breadth includes fatty animal products, potentially creating nuisance in meat storage or rendering facilities.

• Pyralis farinalisSimilar size, coloration, and stored product habitat; P. farinalis has broader, more triangular forewings and different wing pattern
• Other Aglossa speciesRequire genitalia dissection or molecular markers for definitive identification; A. caprealis is the most widespread and commonly encountered member of genus

• stored product pest
• cosmopolitan
• scavenger
• pyralid
• grain pest

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life