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Species Acronicta dactylina - Fingered Dagger - Hodges#9203

Fingered Dagger - Acronicta dactylina Fingered Dagger Moth - Acronicta dactylina Fingered Dagger Moth - Acronicta dactylina Moth - Acronicta dactylina 2225 Acronicta dactylina - Fingered Dagger or Alder Dagger 9203 - Acronicta dactylina Fingered Dagger - Acronicta dactylina - Hodges#9203 - Acronicta dactylina Noctuidae: Acronicta dactylina - Acronicta dactylina 9203, Acronicta dactylina, Fingered Dagger - Acronicta dactylina
Show images of: caterpillars · adults · both
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
No Taxon (Moths)
Superfamily Noctuoidea
Family Noctuidae (Owlet Moths)
Subfamily Acronictinae
Genus Acronicta (Dagger Moths)
Species dactylina (Fingered Dagger - Hodges#9203)
Hodges Number
9203
Other Common Names
Alder Dagger
Synonyms and other taxonomic changes
western populations formerly considered a separate species (Acronicta hesperida) are now considered synonymous with A. dactylina (see Lafontaine and Troubridge, 1998)
Explanation of Names
DACTYLINA: from the Latin "dactylus" (a finger); the origin of the common name but it is not clear how that name applies to this species
Numbers
uncommon, but widely distributed
Size
wingspan 45-55 mm
Identification
Adult: Powdery gray FW with darker markings and whitish HW. FW with the normal markings somewhat broken and blurred, the outer part of the PM and a partial reniform spot most prominent. The orbicular spot is a small, hollow ring. There is no basal dash. The anal "dagger mark" is blurred but obvious. The male hindwings are white with grey scales along the veins. The female is larger and is more heavily dusted with grey on the hindwings. Antennae in both sexes are simple.
Larva: body covered with stiff orange or brown hair dorsally, and pale yellowish or white hair laterally, with several much longer black hairs and white hairs concentrated near the front and back (may also have three dense dorsal tufts of long black hair on abdominal segments 1, 3, and 8)
Range
all of United States and southern Canada (Newfoundland to Florida, west through Texas to California, north to British Columbia)
Habitat
deciduous and mixedwood forest
Season
adults may be active from April to September but normally have a more restricted flight season (May to August, or just June and July, depending on location)
larvae present from July to October
Food
larvae feed on alder, birch, poplar, hawthorn, willow
Life Cycle
one generation per year; overwinters as a pupa in leaves or debris protected in tough oval cocoon of coarse silk and hair (1)
Remarks
large, pale, poorly marked adults of western populations were until recently considered a separate species (Acronicta hesperida), and are still listed as such on a number of sites
See Also
American Dagger which is darker grey-brown on both wings and has a doubled, white-filled PM. (compare images of both species)
Cottonwood Dagger, which is smaller and has narrower wings with a basal dash on the FW.
Internet References
description plus habitat, biology, distribution, food plants, and citation of A. hesperida as a former species (Strickland Entomological Museum, U. of Alberta)
pinned adult image (James Adams, Dalton State College, Georgia)
pinned adult image (Insects of Cedar Creek, Minnesota)
live larva and adult images plus seasonality (Jeremy Tatum, Butterflies and Moths of Southern Vancouver Island)
Works Cited
1.Photo Field Guide to Some Caterpillars of Southern Ontario
Ian Carmichael and Ann Vance. 2004. St. Thomas Field Naturalist Club Incorporated.