Euxoa clausa

McDunnough, 1923

Euxoa clausa is a noctuid described by James Halliday McDunnough in 1923. It is restricted to the north-western Great Plains of North America, with a wingspan of approximately 33 mm. are active in mid-summer, with one per year.

Euxoa clausa by (c) Doug Macaulay, some rights reserved (CC BY), uploaded by Doug Macaulay. Used under a CC-BY license.

Pronunciation

How to pronounce Euxoa clausa: //juːkˈsoʊə ˈklɔːsə//

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Identification

No specific diagnostic features distinguishing Euxoa clausa from are documented in available sources. Identification likely requires examination of genitalia or other subtle morphological characters typical of the Euxoa.

Images

Appearance

Wingspan approximately 33 mm. Specific coloration and pattern details are not documented in available sources.

Habitat

North-western Great Plains grassland .

Distribution

North America: southern Saskatchewan and Alberta, Canada; south to south-western Montana and Nebraska, USA. GBIF records confirm presence in Alberta and Saskatchewan.

Seasonality

on wing July to August. One per year.

Life Cycle

(one per year). Larval stages and details are not documented.

Behavior

; attracted to light. are active during mid-summer nights.

Similar Taxa

Euxoa messoriaOverlaps in Great Plains distribution and similar period; separation requires detailed morphological examination
Euxoa ochrogasterSympatric in prairie ; Euxoa often require dissection for reliable identification
Euxoa auxiliarisRelated with broader distribution; differs in ecological habits including migratory not reported for E. clausa

More Details

Taxonomic History

Described by Canadian entomologist James Halliday McDunnough in 1923. The specific epithet 'clausa' (Latin for 'closed') may refer to a morphological feature of the genitalia or wing venation, though original description not consulted.

Research Gaps

Larval plants, stages, and detailed requirements remain undocumented. The has received minimal study beyond original description and basic distribution records.