Agraylea

Adults are distinguished from other Hydroptilidae by genitalic characters, particularly the structure of the male claspers and aedeagus. The forewings typically lack crossveins beyond the discoidal cell, a trait shared with related genera but with species-specific variations in wing shape and setation. Larvae construct distinctive portable cases from sand grains or detritus, often curved or spiral in form; case morphology varies among species and provides a useful diagnostic character when combined with head capsule sclerotization patterns.

Larvae inhabit clean, flowing freshwater systems including streams, springs, and small rivers. They are typically found in areas with moderate current and stable substrates such as gravel, cobble, or aquatic vegetation. Adults are found in riparian vegetation near larval habitats.

Recorded from northern Europe (Denmark, Norway, Sweden) and North America (including Vermont, United States). The genus likely has a broader Holarctic distribution given the documented records from both continents.

Larvae function as shredders or gatherers in stream food webs, processing fine organic matter and contributing to nutrient cycling. As microcaddisflies, their small size allows them to exploit interstitial spaces in substrates unavailable to larger invertebrates.

• HydroptilaBoth are microcaddisfly genera in Hydroptilidae with reduced wing venation; distinguished by male genitalia structure and larval case morphology, with Hydroptila cases typically straighter and more tubular.
• IthytrichiaOverlaps in size and habitat; Agraylea species generally have more pronounced wing markings and differ in genitalic configuration.

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