Acronicta longa

Guenée, 1852

long-winged dagger moth

Acronicta longa is a North American noctuid commonly known as the long-winged dagger moth. The was first described by Achille Guenée in 1852. have a wingspan of 32–44 mm. Larvae feed on the foliage of several woody plant species including birch, oak, and willow.

CATALOGUE-BM-PLATE CXXVII by Sir GEORGE F. HAMPSON, Bart.. Used under a Public domain license.

Acronicta longa P1180883a by
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Pronunciation

How to pronounce Acronicta longa: //ˌækrəˈnɪktə ˈlɔŋɡə//

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Identification

Distinguished from other Acronicta by its relatively elongated, narrow forewings. The specific epithet 'longa' refers to this wing shape. Similar species include other dagger moths in the Acronicta, which typically have broader, more rounded forewings. Definitive identification may require examination of genitalia or dissection.

Images

Appearance

have a wingspan of 32–44 mm. The forewings are relatively long and narrow compared to other dagger moths, giving the its . Coloration is typically dull gray-brown with subtle patterning. The hindwings are paler. Larvae are not described in detail in available sources.

Habitat

Associated with deciduous forests and woodlands containing plants. Larvae have been recorded on birch, blackberry, oak, and willow, suggesting occupancy of mixed hardwood forests, riparian corridors, and scrub where these plants occur.

Distribution

Transcontinental in North America. Documented from Nova Scotia to Alberta in Canada, and south to Florida and Texas in the United States. GBIF records confirm presence in Alberta, Manitoba, and Saskatchewan in Canada, and Vermont in the United States.

Diet

Larvae feed on the foliage of birch (Betula spp.), blackberry (Rubus spp.), oak (Quercus spp.), and willow (Salix spp.). feeding habits are not documented in available sources.

Host Associations

Betula - larval food plantbirch
Rubus - larval food plantblackberry
Quercus - larval food plantoak
Salix - larval food plantwillow

Ecological Role

Larval herbivore on woody deciduous plants. Contributes to nutrient cycling through foliar consumption. May serve as prey for and other natural enemies, though specific interactions are not documented.

Similar Taxa

Acronicta americanaSimilar (American dagger ) and general appearance, but A. americana has broader forewings and larvae are associated with different plants including maple and box elder.
Acronicta radcliffeiAnother North American dagger with similar size and coloration; distinguished by wing shape and pattern details.

More Details

Taxonomic Note

Acronicta longa is the type for the concept of 'Long-winged Dagger and Allies' used in some taxonomic databases, though this appears to be an informal grouping rather than a formally recognized clade.