Species Details

Acronicta interrupta

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

Common NameInterrupted Dagger Moth SeasonalityA worn adult was collected in Alberta in mid August. IdentificationA medium-size (3.5-4.2 cm wingspan) pale grey moth. The forewings have a prominent black basal dash, which forks upward and downward at the antemedian line, and a thin, prominent black streak through a dark patch ("dagger-mark") in the anal angle. The cross-lines, with the exception of the postmedian line, are incomplete and indicated mainly by black marks where they meet the costa. The orbicular is a prominent pale spot narrowly outlined in dark scales. The reniform is vestigial, and consists of a dark marking the proximal side. The postmedian line is complete, s-shaped, doubled, and filled with white scales. The fringe is checkered, with the dark scales between the veins. The hindwing is dirty white in the male, darkening near the outer margin and along the outer veins, and light grey with a faint postmedian band in the female. Antennae in both sexes simple.

Scientific Name Acronicta interrupta Common Name Interrupted Dagger Moth Habitat Dry deciduous woodland edge and tall shrub. Seasonality A worn adult was collected in Alberta in mid August. Identification
A medium-size (3.5-4.2 cm wingspan) pale grey moth. The forewings have a prominent black basal dash, which forks upward and downward at the antemedian line, and a thin, prominent black streak through a dark patch…
A medium-size (3.5-4.2 cm wingspan) pale grey moth. The forewings have a prominent black basal dash, which forks upward and downward at the antemedian line, and a thin, prominent black streak through a dark patch ("dagger-mark") in the anal angle. The cross-lines, with the exception of the postmedian line, are incomplete and indicated mainly by black marks where they meet the costa. The orbicular is a prominent pale spot narrowly outlined in dark scales. The reniform is vestigial, and consists of a dark marking the proximal side. The postmedian line is complete, s-shaped, doubled, and filled with white scales. The fringe is checkered, with the dark scales between the veins. The hindwing is dirty white in the male, darkening near the outer margin and along the outer veins, and light grey with a faint postmedian band in the female. Antennae in both sexes simple.
Life History A solitary defoliator of deciduous trees and shrubs. There is a single annual brood that overwinters in the pupal stage. Adults come to light. Conservation Rare, at the extreme western edge of it's range in southeastern Alberta. Diet Info
A variety of deciduous trees and shrubs. No Alberta data, but elsewhere in Canada White elm (Ulmus americana) appears to be the main larval host, with the occasional record of pin cherry (Prunus pennsylvanicus),…
A variety of deciduous trees and shrubs. No Alberta data, but elsewhere in Canada White elm (Ulmus americana) appears to be the main larval host, with the occasional record of pin cherry (Prunus pennsylvanicus), Ironwood (Ostrya virginiana), Mountain ash (Sorbus sp.), White and Yellow birch (Betula papyrifera and B. lutea), and willow (Salix sp.). Other hosts include apple (Malus sp.), oak (Quercus) and hawthorn (Craetagus).
Range
Across southern Canada south of the Boreal forest, from New Brunswick west to eastern Alberta, south to GA, NE, and AR. In Alberta it has been collected only once to date (2001), in riparian shrub along the South…
Across southern Canada south of the Boreal forest, from New Brunswick west to eastern Alberta, south to GA, NE, and AR. In Alberta it has been collected only once to date (2001), in riparian shrub along the South Saskatchewan River near the Saskatchewan border, south of Empress. An eastern species that barely reaches Alberta in the dry southeastern part of the province.

Citation

Page Citation for Acronicta interrupta

Page Citation

"Species Details - Acronicta interrupta, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-2842. Accessed 11 Aug. 2022.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Noctuoidea Family Noctuidae Subfamily Acronictinae Genus Acronicta Species Acronicta interrupta
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum