Coleophora badiipennella

Distinguished from other Coleophora species by combination of pale brownish forewing coloration, small size (9–11 mm wingspan), and June–July flight period. Larval cases may be found on host plants. Genitalia dissection is typically required for definitive identification among congeners. Similar species include other pale Coleophora of similar size, which may require microscopic examination.

Small moth with wingspan of 9–11 mm. Forewings are narrow and elongated, characteristic of the genus Coleophora. Coloration is pale brownish (badiipennella translates to 'brownish-winged'), with subtle patterning. Antennae are long relative to body size. The slender body and pointed wing tips create a distinctive silhouette.

Deciduous woodlands, hedgerows, parks, and urban areas where host trees occur. Associated with elm-dominated habitats but adaptable to mixed stands containing other larval host plants including hazel, blackthorn, ash, and maple.

Native to Europe, ranging from Fennoscandia south to the Mediterranean Sea, and from Great Britain east to southern Russia. Introduced and established in North America. Records confirmed from Belgium and other European countries.

Adults fly from June to July, with exact timing varying by location and latitude. Single-brooded (univoltine).

Larvae feed on leaves of Ulmus procera (English elm), Ulmus minor (field elm), Corylus (hazel), Prunus spinosa (blackthorn), Fraxinus (ash), and Acer (maple). Larval feeding involves mining leaves and constructing portable silk cases characteristic of the family.

• Ulmus procera - larval food plantEnglish elm, primary host
• Ulmus minor - larval food plantField elm
• Corylus - larval food plantHazel species
• Prunus spinosa - larval food plantBlackthorn
• Fraxinus - larval food plantAsh species
• Acer - larval food plantMaple species

Complete metamorphosis with four stages: egg, larva, pupa, adult. Larvae construct portable silk cases incorporating plant material, which they carry while feeding. Larval stage overwinters in case attached to host plant or ground litter. Pupation occurs within the case. Single generation per year.

Adults are nocturnal and attracted to light. Larvae are solitary feeders that construct and inhabit portable silk cases, enlarging them as they grow. Larvae feed by mining leaf tissue from within or near their case.

Leaf miner and herbivore on deciduous trees. Contributes to nutrient cycling through leaf litter production. Serves as prey for generalist predators including birds and parasitoid wasps. Not considered a significant pest despite broad host range.

Minor interest to lepidopterists. Common name 'Pale Elm Case-bearer' reflects association with elm trees. No significant economic impact; not a forestry or horticultural pest. Presence indicates healthy deciduous woodland habitat.

• Other Coleophora speciesMany congeners share similar size, pale coloration, and case-bearing larval biology. Definitive identification often requires genitalia examination.
• Coleophora siccifoliaSimilar pale coloration and elm association; distinguished by subtle wing pattern differences and larval case structure.

• moth
• case-bearer
• leaf miner
• elm-associated
• Palearctic
• Nearctic introduced
• univoltine
• silken case

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