Landryia impositella

Distinguished from similar microlepidoptera by combination of extremely small size (4–5 mm), slender body, and association with composite flowers. Differs from Scythris and Neoscythris by genitalia structure: Landryia species possess strikingly asymmetrical genitalia. Accurate identification to species level requires dissection and examination of genitalia; external morphology alone is insufficient.

Extremely small moth with a slender, elongate body. Total length approximately 4–5 mm. Wings narrow and pointed, held tent-like over the body at rest. Coloration typically dull grayish or brownish without striking pattern. Antennae simple, filiform, relatively long in proportion to body size.

Prairie and grassland environments. Associated with clay banks and embankments in semi-arid regions. Adults found on flowering shrubs, particularly composites (Asteraceae) with small yellow flowers such as broom snakeweed (Gutierrezia sarothrae).

Recorded from Alberta, Manitoba, and Saskatchewan in Canada, and from Vermont in the United States. Distribution appears centered in the Great Plains and Prairie Provinces, with eastern outlier records.

Adults active in late summer and early fall. Observation records from September in Nebraska and surrounding regions.

Adults active during daylight hours on flowers. Exhibit nervous, rapid movement making them difficult to observe and photograph. Aggregations may occur on suitable flowering plants.

• Scythris mixaulaSimilar size and habitat preference; abundant in western states but distinguished by host association with cactus and different genitalia structure
• Neoscythris speciesOverlap in size, habitat, and flower-visiting behavior; distinguished by symmetrical genitalia and subtle external morphological differences requiring expert examination

• microlepidoptera
• prairie
• flower moth
• Asteraceae associate

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Tiny little slivers of life | Beetles In The Bush