Trichoptilus pygmaeus
Walsingham, 1880
Pygmy Plume Moth
Trichoptilus pygmaeus is a minute ( Pterophoridae) with a wingspan of approximately 10 mm. It is one of the smallest members of its family in North America. The exhibits the characteristic divided wings of plume moths, with forewings split into two lobes. Larvae feed on specific plants including Chrysopsis scabrella and Arctostaphylos columbiana, consuming young leaves and bracts of unopened flowers.
Pronunciation
How to pronounce Trichoptilus pygmaeus: /tɹɪˈkɒptɪləs pɪɡˈmiːəs/
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Identification
Distinguished from other Trichoptilus by small size (10 mm wingspan), pale fawn forewing ground color with two indistinct white transverse stripes, and specific pattern of fuscous scaling along . Similar species Trichoptilus potentellus is sometimes listed as a synonym. Separation from other small plume moths requires examination of genitalia or detailed wing pattern analysis.
Habitat
Associated with plant where Chrysopsis scabrella (a goldenrod ) and Arctostaphylos columbiana (Columbian manzanita) occur. Specific habitat requirements beyond host plant presence are not documented.
Distribution
North America: recorded from California, Florida, and British Columbia. Additional records from GBIF suggest broader distribution in Canada and United States.
Seasonality
activity period not explicitly documented. Larval feeding occurs on young leaves and flower bracts, suggesting spring to summer activity coinciding with plant growth and flowering.
Diet
Larvae feed on young leaves and bracts of unopened flowers of Chrysopsis scabrella and Arctostaphylos columbiana. Specific feeding habits unknown.
Host Associations
- Chrysopsis scabrella - larval food plantLarvae feed on young leaves and bracts of unopened flowers
- Arctostaphylos columbiana - larval food plantColumbian manzanita
Life Cycle
Complete (, larva, pupa, ). Larvae feed on plant foliage and flower bracts. Specific details of and stage unknown.
Behavior
No specific behavioral observations documented beyond larval feeding habits.
Ecological Role
Herbivore; larval feeding on specific plants. Role in as prey for and assumed but not documented.
Human Relevance
No documented economic or cultural significance. Occasionally encountered by lepidopterists and naturalists.
Similar Taxa
- Trichoptilus potentellusSometimes listed as synonym; requires taxonomic verification
- Other Trichoptilus speciesSimilar small size and wing division; separation requires detailed examination of wing patterns and genitalia
More Details
Taxonomic Note
Trichoptilus potentellus is sometimes listed as a synonym, but taxonomic status requires verification. The epithet 'pygmaeus' refers to its diminutive size among plume moths.