Pheosia rimosa

Packard, 1864

Black-rimmed Prominent, Fissured Prominent, False-sphinx

Pheosia rimosa is a in the Notodontidae, first described by Alpheus Spring Packard in 1864. It is widely distributed across North America with a notable gap in the southeastern United States. The exhibits a wingspan of 43–62 mm and are active from spring through fall. Larvae feed on leaves of Populus and Salix species. The Pheosia portlandia, previously considered a distinct Pacific coastal species, has been synonymized with P. rimosa.

Pheosia taiwanognoma1 by Hsu Hong Lin. Used under a CC BY-SA 2.0 license.

- 7922 – Pheosia rimosa – Black-rimmed Prominent - 52122794929 by Wildreturn. Used under a CC BY 2.0 license.

Pheosia taiwanognoma by Hsu Hong Lin. Used under a CC BY-SA 2.0 license.

Pronunciation

How to pronounce Pheosia rimosa: /fiːˈoʊziə rɪˈmoʊsə/

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

Identification

The combination of broad transcontinental North American distribution, spring-to-fall activity period, and association with Populus and Salix distinguishes this from other Notodontidae. The dark-rimmed forewing pattern is a key visual characteristic. Pheosia rimosa may be confused with other prominent moths in the Pheosia; accurate identification relies on wing pattern details and geographic context. The former species Pheosia portlandia is now recognized as .

Images

Habitat

Associated with supporting Populus and Salix , which serve as larval plants. These include riparian zones, deciduous woodlands, and areas with willow and poplar stands. Specific microhabitat preferences for are not documented.

Distribution

Transcontinental in North America, occurring from the Atlantic to Pacific coasts. Documented from Canadian provinces including Alberta, Manitoba, and Saskatchewan, and from the United States including Vermont. Notably less common in the southeastern United States. The Pheosia rimosa taiwanognoma occurs in Taiwan.

Seasonality

are on wing from spring through fall, representing a prolonged period spanning multiple months. Specific varies by latitude and local climate conditions.

Diet

Larvae feed on leaves of Populus (poplars, cottonwoods, aspens) and Salix (willows) . feeding habits are not documented.

Host Associations

Populus - larval leaves
Salix - larval leaves

Life Cycle

Complete with , larval, pupal, and stages. Larvae feed on plant foliage. Specific details regarding oviposition site, location, and stage are not documented in available sources.

Behavior

are and attracted to light. Specific behavioral details such as mating rituals, patterns, or defensive are not documented.

Ecological Role

Larvae function as primary consumers, feeding on leaves of deciduous trees and shrubs in the Populus and Salix. Their role in nutrient cycling and as a food source for has not been quantified. The contributes to the herbivore guild associated with early successional and riparian .

Human Relevance

No significant documented economic impact. The is not considered a major pest of ornamental or commercial Populus or Salix plantings. Of interest to lepidopterists and naturalists due to its wide distribution and distinctive appearance.

Similar Taxa

Pheosia portlandiaPreviously treated as a distinct occurring in Pacific coastal forests; now synonymized with P. rimosa based on research concluding they represent the same species.
Other NotodontidaeThe prominent contains numerous with cryptic forewing patterns; accurate identification requires examination of wing pattern details, particularly the fissured line and dark marginal band characteristic of P. rimosa.

More Details

Taxonomic History

Pheosia portlandia was historically recognized as a separate replacing P. rimosa in Pacific coastal forests. Research has concluded that P. portlandia is a synonym of P. rimosa, unifying the across North America.

Subspecies

Two are recognized: Pheosia rimosa rimosa (North America) and Pheosia rimosa taiwanognoma Nakamura, 1973 (Taiwan). The Taiwanese subspecies represents a disjunct Asian distribution.