Limnaecia phragmitella

Distinguished from similar small ochreous moths by the combination of two grey-brown white-edged spots on the forewing connected by a line, the grey-brown anal fold line with preceding white spot, and the series of whitish apical dots. Larval presence indicated by seed down hanging from bulrush seed heads due to silk binding. Male genitalia with strongly asymmetrical brachia and valvellae provide definitive identification.

Small moth with wingspan 15–22 mm. Head ochre-coloured; antennae yellowish-white with brown rings and almost white apical area. Thorax and tegulae ochre. Forewings ochre with pale yellow costa; indistinct grey-brown line follows anal fold with elongated white spot distally; two grey-brown white-edged spots in middle of wing (inner spot before halfway, outer at 3/4 length), connected by grey-brown line from wing base; apical area with grey-brown veining occasionally outlined in white; series of whitish dots along apex; fringe pale ochre, more yellowish towards inner edge. Hindwings grey. Abdomen brownish-grey with yellowish-white bands on posterior segments.

Fens and marshes; wet areas supporting stands of bulrush (Typha species).

Europe (widespread including UK), Asia, Australia, New Zealand, and North America (Nova Scotia to Virginia, west to Oklahoma, north to Ontario).

Adults active July in western Europe; June to August in North America.

• Typha latifolia - larval foodplantBulrush; larvae mine in seed heads and stems
• Typha angustifolia - larval foodplantLesser Bulrush; larvae mine in seed heads and stems

Early instar larvae mine within leaf sheaths before moving to seed heads; later instars occupy seed heads and stems of host bulrushes. Larval silk binds seed down, preventing wind dispersal.

Larvae produce silk that prevents seed down dispersal by wind; this silk binding makes larval presence detectable by the characteristic appearance of down hanging from seed heads. Adults described as 'shy' in common name, though specific behavioral basis for this is not documented in sources.

Larval feeding within bulrush seed heads may influence seed production and dispersal dynamics in wetland ecosystems.

• Other Limnaecia speciesSimilar size and general appearance; distinguished by specific forewing spot pattern and genitalia structure
• Other CosmopterigidaeMany small ochreous micro-moths in family; L. phragmitella distinguished by characteristic two-spot forewing pattern with connecting line and association with Typha hosts

• micro-moth
• leaf-miner
• seed-head feeder
• wetland
• bulrush
• Typha

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The genome sequence of the Shy Cosmet Moth, Limnaecia phragmitella Stainton, 1851 (Lepidoptera: Cosmopterigidae).