Euxoa auripennis

Lafontaine, 1974

Euxoa auripennis is a noctuid described by J. Donald Lafontaine in 1974. It occurs in western North America from the Great Plains to the Pacific coast. fly in late summer with a single . The is one of many Euxoa cutworms whose larvae feed on herbaceous vegetation.

Pronunciation

How to pronounce Euxoa auripennis: /juˈksa ɔːrɪˈpɛnɪs/

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Identification

Euxoa auripennis can be distinguished from similar Euxoa by its western North American distribution combined with period in August–September. Genitalia examination is required for definitive identification from closely related species. The combination of size, wing pattern, and geographic location helps separate it from eastern .

Appearance

have a wingspan of 30–34 mm. The forewings are gray-brown with typical noctuine patterning including and spots. The hindwings are pale with darker margins. The specific epithet 'auripennis' refers to golden or yellowish wing markings.

Habitat

Occurs in open including grasslands, prairies, and agricultural areas across western North America. Associated with herbaceous vegetation at the soil surface where larvae feed.

Distribution

Western North America from eastern North Dakota and southwestern Manitoba west to central British Columbia, south to southern California and Colorado. Present in Alberta, Saskatchewan, and Manitoba in Canada.

Seasonality

are active from August to September. One per year. Larvae are present through fall, winter, and spring.

Diet

Larvae feed on various herbs at the soil surface.

Life Cycle

Overwinters as larvae. occurs in soil. emerge in late summer. Single ().

Behavior

are and attracted to light. Larvae are cutworms that feed at or near the soil surface, severing plant stems or consuming foliage.

Ecological Role

Larvae function as herbivores in grassland and agricultural . may serve as prey for including bats and birds.

Human Relevance

Potential minor agricultural pest as larvae feed on herbaceous plants. Not known to cause significant economic damage.

Similar Taxa

Euxoa auxiliarisAlso a western North American Euxoa , but has different period (spring–early summer) and is larger with different wing pattern
Other Euxoa speciesMany Euxoa are morphologically similar; accurate identification requires genitalia dissection and geographic data

More Details

Taxonomic history

Described by Canadian lepidopterist J. Donald Lafontaine in 1974, relatively recently compared to many noctuid described in the 19th century. This reflects ongoing refinement of Euxoa in North America.