Acronicta marmorata

Smith, 1897

marble dagger moth, Marbled Oak Dagger

Acronicta marmorata, commonly known as the marble dagger or Marbled Oak Dagger, is a to western North America. The species is characterized by its marbled pattern and moderate size, with a wingspan of approximately 43 mm. are active during mid-summer months, with specializing on oak foliage.

Acronicta marmorata by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Acronicta marmorata (41928654365) by Donald Hobern from Copenhagen, Denmark. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Acronicta marmorata: //æˈkrɒnɪktə mɑːmɔːˈrɑːtə//

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

Identification

The can be distinguished from other dagger in the Pacific Northwest by its marbled gray pattern combined with its specific geographic range. Similar species such as Acronicta americana ( dagger moth) occur in different regions and show different patterns. Acronicta betulae (birch dagger moth) has a more eastern distribution and different associations. Examination of may be required for definitive identification of similar Acronicta species.

Images

Appearance

have a wingspan of approximately 43 mm. The display a marbled pattern of gray and darker markings, typical of the dagger group. The 'marble dagger moth' refers to this mottled appearance. Like other Acronicta , the wings may show subtle pattern variations between individuals.

Habitat

Associated with oak woodlands and forests where trees occur. The inhabits areas supporting Quercus species, particularly in mesic to dry forest conditions typical of the Pacific Northwest.

Distribution

Widespread in the Pacific West of North America. Documented from British Columbia, Canada south through Washington and Oregon in the United States. GBIF records confirm presence in North America.

Seasonality

are on from July to August, with exact timing varying by location within its range.

Diet

feed on oak (Quercus), including oak. feeding habits are not documented.

Host Associations

Quercus - larval including oak

Life Cycle

with , , , and stages. Larval stage is the feeding and growing phase, specializing on oak foliage. presumably occurs in soil or leaf litter, as typical for , though specific details are not documented.

Behavior

are and attracted to light. The shows typical with night-flying activity and daytime resting on substrates where cryptic coloration provides .

Ecological Role

Larval stage functions as a folivore on oak trees, contributing to in oak woodland . The is part of the supporting and of .

Human Relevance

No significant economic or agricultural impact has been documented. The is of interest to and naturalists in the Pacific Northwest. Occasionally encountered by blacklight enthusiasts during summer surveys.

Similar Taxa

Acronicta americanaSimilar ( dagger ) but occurs in eastern and central North America, not the Pacific West; different pattern and associations
Acronicta betulaeBirch dagger has eastern distribution and associates with birch rather than oak

More Details

Common name variation

The is referred to as both 'marble dagger ' and 'Marbled Oak Dagger' in different sources, with the former being more widely used in general references and the latter appearing in iNaturalist and some field contexts.