Tridentaformidae

Distinguishable from other Adeloidea families by the unique trident-shaped male phallus with lateral branches half the length of the median branch, combined with the broad valva bearing multiple rows of pecten spines. DNA barcoding shows 14.3% COI divergence between T. fuscoleuca and T. browncopper; the latter has diagnostic COI substitutions at nucleotide positions 118-C, 250-C, and 277-A. Superficially similar to other small brown micromoths but requires genitalic or molecular examination for definitive identification.

Grassy clearings within coniferous forest, particularly Douglas fir (Pseudotsuga menziesii) dominated systems. Occupies both natural and disturbed sites including recently reclaimed waste-rock areas (<5 years), long-term reclaimed agricultural grassland (>20 years), unmined reference sites, and post-fire environments (two years post-burn).

Thompson Plateau in south-central British Columbia, Canada; California, USA. Eight BINs assigned to Tridentaforma on BOLD suggest broader undescribed distribution.

Adults active July through October based on Malaise trap sampling data.

Attracted to Malaise traps. No other behavioral details documented.

Subject of biodiversity monitoring and DNA barcoding studies; second species discovered through routine biomonitoring in mining-impacted landscapes.

• AdelidaeOther family in superfamily Adeloidea; distinguished by extremely long antennae (especially males) and different genitalic structure lacking trident phallus and pecten-bearing valva
• NemophoraGenus in Adelidae with superficially similar small brown moths; distinguished by antennae length and male genitalic morphology

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• The brown copper moth, Tridentaforma browncopper: DNA barcoding reveals a second species in the family Tridentaformidae (Lepidoptera, Adeloidea).