Apantesis nevadensis

(Grote & Robinson, 1866)

Nevada tiger moth

Species Guides

Apantesis nevadensis superba(Grammia nevadensis superba)

Apantesis nevadensis, the Nevada tiger moth, is a small tiger moth in the Erebidae. It was described by Grote and Robinson in 1866. The occurs across western North America from the Pacific Northwest through the Rocky Mountain states and intermountain region, extending into the Canadian prairies. It inhabits arid and semi-arid environments including deserts, sagebrush rangelands, juniper woodlands, and open forests. The species was transferred from the Grammia to Apantesis in 2009 along with related tiger moth genera.

Pronunciation

How to pronounce Apantesis nevadensis: /əˈpæntəsɪs ˌnɛvəˈdɛnsɪs/

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

Identification

Small to medium-sized tiger moth with forewing length 15–18 mm. Distinguished from similar Apantesis by geographic range and preferences in arid western regions. Forewing pattern of dark and light bands or spots; hindwings with bright aposematic coloration. Genitalic dissection or may be required for definitive identification from closely related sympatric Apantesis species.

Appearance

Forewing length 15–18 mm. Pattern and coloration typical of Apantesis tiger moths, with banded or spotted forewings. Hindwings usually display bright warning coloration characteristic of tiger moths, often with red, orange, or yellow patches contrasting with dark markings. Body moderately robust with moderately dense scaling.

Habitat

Deserts, juniper woodlands, open sagebrush rangelands, and open forests in arid to semi-arid regions.

Distribution

Pacific Northwest of North America; intermountain region; Rocky Mountain states of USA. In Canada: Alberta, southern Saskatchewan, and Manitoba.

Diet

Larvae feed on herbaceous plants including Lupinus and Viola beckwithii.

Host Associations

Lupinus - larval food plantvarious
Viola beckwithii - larval food plant

Ecological Role

Larval herbivore; likely serves as prey for and contributes to pollination. As a tiger moth, may possess defensive chemical compounds acquired from plants or synthesized de novo.

Human Relevance

No significant economic or agricultural impact documented. Subject of general entomological interest and citizen science observation.

Similar Taxa

Apantesis phalerataSimilar size and pattern; may overlap in range; requires detailed examination for separation
Grammia speciesFormerly classified in same ; similar and ; distinguished by revised generic placement based on phylogenetic studies

More Details

Taxonomic history

Transferred from Grammia to Apantesis in 2009 based on molecular phylogenetic studies by Schmidt et al., along with from genera Holarctia and Notarctia. This reclassification reflects modern understanding of tiger moth evolutionary relationships.

Subspecies

Five recognized: A. n. nevadensis (Rocky Mountains to Pacific), A. n. geneura (Stretch, 1878), A. n. gibsoni (McDunnough, 1937), A. n. superba (Stretch, 1873) from British Columbia and Washington Cascades, and A. n. vivida B.C. Schmidt, 2009 from Alberta and Peace River.