Taxonomic Notes
Euphydryas anicia was once considered a subspecies of E. chalcedona, but is now recognized as a distinct species (Emmel et al. 1998, Opler and Warren 2002, Pelham 2020), with as many as 24 subspecies (Pelham 2020).
Justification
The Anicia Checkerspot Butterfly (Euphydryas anicia) is found in a variety of montane habitats across much of the Intermountain West, from Alaska, USA in the north to Sonora, Mexico in the south. While the population size and trend are unknown, this species is likely stable and no range-wide threats have been reported. As this species is widespread and relatively common, it is considered Least Concern. However, increased monitoring is needed to ensure population declines are not taking place.
Geographic Range Information
The Anicia Checkerspot Butterfly (Euphydryas anicia) is widespread throughout much of western North America, in Canada, the United States, and Mexico. It occurs from Alaska and the Yukon in the north to Sonora in the south, and from the West Coast east to the Rocky Mountains (Cary and Toliver 2022, Glassberg 2017). It is found from 450 to 4,400 metres in elevation (GBIF.org 2022) and the extent of occurrence (EOO) for this species is almost five million km².
Population Information
The population size and trend for this species are not known. The population appears stable, as a large number of occurrences have been reported in the last 10 years (n=463) (GBIF.org 2022). However, some subspecies have experienced declines, so monitoring is necessary to ensure declines are not ongoing. As this is primarily a montane species, it may be at risk to the impacts of climate change (Forister et al. 2010). No population size estimates exist for this species across its range. However, in 1979, a mark recapture study estimated a localized population of 50,000 to 100,000 individuals across several mountain tops in Gunnison County, Colorado (Cullenward et al. 1979). Cullenward et al. (1979) assert this was the largest population they had observed in 19 years, across 12 well studied, distinct areas. It is unknown if the population numbers in that area remain robust.
Habitat and Ecology Information
The Anicia Checkerspot is found in a variety of habitats, from drier open foothill shrub-scrub to high grasslands and alpine summits (Glassberg 2017, Pyle and LaBar 2018). Larvae usually feed on plants in the Snapdragon or Figwort Family (Scrophulariaceae), such as paintbrushes (Castilleja spp.), Alpine Besseya (Besseya alpina), and penstemons (Penstemon spp.) (Cullenward et al. 1979, Cary and Toliver 2022, Glassberg 2017). Depending on altitude and latitude, the adult flight period can be from March through August, though in most areas it is June to July (Glassberg 2017). Adults nectar on a variety of plants, including buckwheat species (Polygonaceae) and asters (Asteraceae) (Cullenward et al. 1979), Chokecherry blossoms (Prunus virginiana), penstemon (Penstemon spp.), and stonecrop (Sedum spp.) (Pyle and LaBar 2018).
Threats Information
There are no range-wide threats documented for this species. Localized threats may be present in some portions of the range. For example, the Sacramento Mountains Checkerspot butterfly, subspecies Euphydryas anicia cloudcrofti, is threatened by climate change related drought, urban development, livestock grazing, and recreational use (Center for Biological Diversity 2021). In general, butterflies in the western US are seen in fewer numbers each year, due to a myriad of threats, such as climate change (Forister et al. 2021). Therefore, more information is needed to ensure populations of this species remain stable.
Use and Trade Information
This species is not utilized.
Conservation Actions Information
There are no species-level conservation measures in place for the Anicia Checkerspot. Population numbers should continue to be tracked through monitoring programs, such as the North American Butterfly Monitoring Network. Several subspecies are narrow endemics and/or have experienced marked declines, including Euphydryas anicia variicolor in California. This has lead to several subspecies being petitioned for listing under the Endangered Species Act (ESA), including Morand's Checkerspot (E. a. morandi) which is endemic to Nevada. One subspecies, the Sacramento Mountains Checkerspot (E. a. cloudcrofti) is federally protected under the ESA (NatureServe 2024).