Ethmia trifurcella

(Chambers, 1873)

Ethmia trifurcella is a small in the Depressariidae, distributed across eastern and central North America. The is characterized by distinctive forewing patterning with a sinuate longitudinal line dividing dark and pale areas. Larvae are specialized herbivores that construct tubular shelters on plant leaves.

Ethmia trifurcella by (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick. Used under a CC-BY license.

- 1003 – Ethmia trifurcella (48043900738) by Andy Reago & Chrissy McClarren. Used under a CC BY 2.0 license.

- 1003 – Ethmia trifurcella (48043957957) by Andy Reago & Chrissy McClarren. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Ethmia trifurcella: /ˈɛθ.miə traɪˈfɜːr.sɛl.lə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

The sinuate longitudinal line on the forewing separates this from many superficially similar small . The combination of dark costal half and pale half of forewing, with a single basal spot, distinguishes it from other Ethmia species. Upturned palps (visible as horn-like projections between ) help separate Depressariidae from similar Tortricidae.

Images

Appearance

Small with forewing length 7.6–9.8 mm. Forewings divided longitudinally by a somewhat sinuate (wavy) dark line; area white or pale gray with a single dark spot at about basal one-third, costal half dark brownish to blackish. Hindwings pale brownish, slightly darker distally.

Habitat

Associated with supporting its larval plant Cynoglossum virginianum; likely includes deciduous woodlands and forest edges in eastern North America.

Distribution

North America: Pennsylvania, Ohio, Kentucky, North Carolina, northern Florida, westward to Nuevo León (Mexico), Arizona, and Wyoming.

Seasonality

active April–September with peak activity varying by region: April (Florida, Ohio), May (Kentucky), June (Nuevo León, Florida), July (Kentucky, Wyoming, Pennsylvania, Maryland), September (North Carolina). Probably (two per year).

Diet

Larvae feed exclusively on Cynoglossum virginianum (Virginia hound's tongue, Boraginaceae). diet unknown.

Host Associations

Cynoglossum virginianum - larval Larvae feed on leaves

Life Cycle

Larvae construct tubular silk shelters on the undersides of plant leaves and feed on leaf tissue within. likely occurs within or near the larval shelter. Two per year inferred from period.

Behavior

Larvae exhibit shelter-building , constructing tubular silk retreats on leaf undersides for protection while feeding. are and attracted to light.

Ecological Role

Herbivore; larval feeding on Cynoglossum virginianum may influence plant in local . Serves as prey for .

Similar Taxa

Other Ethmia speciesMany Ethmia share similar black-and-white or gray patterning; E. trifurcella distinguished by specific forewing pattern with sinuate dividing line and single spot
Tortricidae (leafroller moths)Superficially similar small ; distinguished by upturned palps in Depressariidae versus flat palps in Tortricidae

More Details

Taxonomic history

Ethmia formerly placed in Coleophoridae, now in Depressariidae (Ethmiinae) based on revised phylogenetic understanding. Family placement has changed historically, reflecting ongoing revision of gelechioid relationships.

Larval shelter construction

The tubular silk shelter built by larvae on leaf undersides is a characteristic in this , providing protection from and desiccation while feeding.