Catocala junctura

Walker, 1858

joined underwing, Stretch's underwing

Catocala junctura is a large underwing in the Erebidae, distributed across temperate North America from the eastern United States through the Great Plains to the Southwest and Pacific Coast. are active from June to September and possess the characteristic underwing : cryptic forewings that conceal brightly colored hindwings. The is associated with riparian where its larval plants, willows and cottonwoods, grow abundantly.

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

Catocala junctura P1220043b by
xpda. Used under a CC BY-SA 4.0 license.

Catocala junctura YPM ENT 448120 D by Gahm, K. J.. Used under a CC0 license.

Pronunciation

How to pronounce Catocala junctura: /ˈkætoʊˌkɑːlə ˈdʒʌŋk.tʃʊə/

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

Identification

Distinguished from similar Catocala by the hooked inner hindwing band that points back toward the wing base rather than reaching the trailing edge. The orange-red hindwing coloration and specific band pattern separate it from with yellow or pink hindwings. The lighter marginal area on the hindwing upperside, separated by the outer black band, is a consistent feature. Forewing pattern of gray-brown with black bands is shared with many underwing species and not diagnostic alone.

Images

Habitat

Typically found near water where larval plants grow plentifully. Associated with riparian corridors, wetlands, and floodplains supporting willow and cottonwood . include cottonwood groves with adjacent wetlands in prairie regions, and mixed riparian woodlands in montane and foothill areas.

Distribution

Temperate North America: east to New York and Pennsylvania, west through Montana, Colorado, Oklahoma, Arizona, and Texas, north to southern Illinois, extreme southern Alberta and Saskatchewan. Also recorded west of the Rocky Mountains in California and south-eastern British Columbia.

Seasonality

on wing June to September, timing varying by location. Probably one per year.

Diet

Larvae feed on willow (Salix) and, in the western portion of the range, Fremont cottonwood (Populus fremontii). feeding habits not documented.

Host Associations

Salix - larval willow
Populus fremontii - larval Fremont cottonwood; western portion of range only

Life Cycle

Complete with probable one per year. stage not explicitly documented in sources. Larval stage feeds on plants; presumably in soil or leaf litter.

Behavior

are . Like other underwing moths, typically rests with forewings folded over body, concealing brightly colored hindwings. When disturbed, may flash hindwings as a startle defense. Generally does not come readily to lights, or remains on the periphery of lighted areas; sometimes found resting on tree trunks and must be flushed for observation.

Ecological Role

Larval herbivore on willows and cottonwoods. likely serve as prey for including bats and birds. Specific role not documented.

Human Relevance

Subject of interest to lepidopterists and citizen scientists; featured in National Week events. No documented economic importance. Historical taxonomic confusion with related has been resolved through recent synonymization of multiple described forms.

Similar Taxa

Catocala electilisFormerly confused under the misapplied name C. aspasia; distinguished by hindwing band pattern and geography
Catocala verillianaOverlapping range and similar size; distinguished by hindwing coloration and band details
Catocala aholibahSympatric in some areas; larger size and different hindwing pattern

Misconceptions

The name 'Catocala aspasia' was frequently misapplied to this in older literature, actually referring to C. electilis. Multiple formerly described species and (including C. stretchii, the source of 'Stretch's underwing') have been synonymized with C. junctura as mere forms without taxonomic rank, though not all authors have adopted these changes.

More Details

Taxonomic history

has undergone significant taxonomic revision. Formerly placed in Noctuidae; now classified in Erebidae following molecular phylogenetic studies. Multiple forms previously described as distinct species or have been merged with C. junctura.

Conservation status

Not formally assessed; appears to be widespread and locally common in appropriate .