Ethmia sphenisca

Powell, 1973

Ethmia sphenisca is a small in the Ethmiidae (formerly Depressariidae), described by Powell in 1973. It is restricted to high-elevation regions of the southwestern United States and Mexico. The is characterized by distinctive black-and-white wing patterning and forewing lengths of 10–13 mm. Like other members of the Ethmia, it likely has larval associations with plants in the Boraginaceae family, though this has not been directly documented for this species.

Pronunciation

How to pronounce Ethmia sphenisca: /ˈɛθ.mi.a sfɛˈnɪs.ka/

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Identification

Distinguished from other Ethmia by the sinuate longitudinal line on the forewing and the specific pattern of white projections with black spots in the area. The combination of high-elevation distribution in Arizona and Mexico with this wing pattern is diagnostic. Similar species in the share the black-and-white coloration but differ in the exact configuration of lines and spots.

Appearance

Forewings 10–13 mm in length. Ground color divided by a sinuate (wavy) longitudinal line running from base to termen. area below this line narrowly white, with pointed projections to the Cu fold at basal one-fourth and beyond Cu at end of , each projection containing a conspicuous black spot. Remainder of wing costad of longitudinal line brownish black or black, only slightly paler toward . Hindwings whitish gray, becoming slightly darker distally.

Habitat

High mountain environments in Arizona and Mexico. Specific microhabitat details are not documented, but are associated with oak woodlands and foothill .

Distribution

North America: high mountains of Arizona, USA; north-western and central Mexico.

Similar Taxa

Other Ethmia speciesShare similar black-and-white wing patterns and small size, but differ in specific line and spot configurations on forewings
Tortricid leafroller mothsCan be confused with Depressariidae, but Ethmia have upturned palps resembling horns between the

More Details

Taxonomic Note

Ethmia was formerly placed in the Coleophoridae, then Depressariidae. Current classifications place the in Ethmiidae. The family placement has been subject to revision based on molecular phylogenetic studies.

Etymology

The specific epithet 'sphenisca' is derived from Greek 'sphen' meaning wedge, likely referring to the wedge-shaped projections on the forewing.