Anerastia lotella

Distinguished from similar pyralid moths by the combination of small size, sandy-brown forewings with white costal streak, and association with sandy grassland habitats. The variable speckling pattern and coastal versus inland size variation can complicate identification; genitalia examination may be necessary for certain separation from congeners.

Small moth with wingspan 19–27 mm. Forewings sandy-brown with variable speckles and streaks, featuring a distinct white costal streak. Hindwings pale. Coastal populations are generally larger and paler; inland populations smaller and darker.

Coastal sand dunes and inland sandy or dry grassland sites. Larvae inhabit the base of grass stems in silken tubes covered with sand particles.

Europe (widespread), western Russia, Asia Minor, Iran, western Turkestan, and most of Canada. In Britain, distribution is local with strong coastal concentration and scattered inland populations.

Adults fly in July. Single-brooded; larval feeding period extends from September through June.

Larvae feed on grass stems and rootstocks, particularly Ammophila arenaria (Marram), Festuca ovina (Sheep's Fescue), Corynephorus canescens, and other Poaceae species.

• Ammophila arenaria - larval food plantMarram; primary host in coastal dunes
• Festuca ovina - larval food plantSheep's Fescue; important host in inland sites
• Corynephorus canescens - larval food plantGrey hair-grass

Single-brooded (univoltine). Adults emerge and fly in July. Eggs laid on or near host grasses. Larvae feed from September through June, constructing silken tubes covered with sand at the base of grass stems. Pupation occurs in a cocoon at the base of the host plant.

Larvae construct silken tubes covered with sand particles at the base of grass stems, using these as shelter while feeding on stems and rootstocks. Adults are nocturnal and attracted to light.

Herbivore; larvae act as primary consumers in sandy grassland ecosystems, feeding on perennial grasses. May contribute to nutrient cycling in dune systems through herbivory and larval tunneling activity.

Subject of genomic research with a published chromosome-level genome assembly. Of minor interest to lepidopterists due to its restricted habitat associations. Not known as an agricultural pest.

• Other Anerastia speciesSimilar size and general pyralid morphology; reliable separation requires examination of genitalia or association with specific habitat and host plants
• Other Phycitinae in sandy habitatsOverlap in habitat use and general appearance; white costal streak and specific grass host associations help distinguish A. lotella

• snout moth
• pyralid
• sand dune specialist
• grass feeder
• univoltine
• genome sequenced

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The genome sequence of the Sandhill Knot-horn moth, Anerastia lotella Hübner, 1813.