Attributes of Euphydryas chalcedona
Chalcedon Checkerspot
Euphydryas chalcedona (Doubleday, [1847])
Family: Nymphalidae
Subfamily: Nymphalinae
Identification: Extremely variable. Forewing narrow. Upperside is black to dark orange-brown with yellow, red, and sometimes white spots. Underside with yellow and orange-red bands.
Wing Span: 1 1/4 - 2 1/4 inches (3.2 - 5.7 cm).
Life History: Males perch or patrol all day for females. Eggs are laid in large groups on underside of leaves of host plants. Caterpillars feed together on leaves, flowers, or bracts in a silk nest. Third- and fourth-stage caterpillars hibernate under rocks or in litter. Caterpillars in high elevations can hibernate for several years.
Flight: One flight; April-June in California and Oregon, June-July in the north and higher elevations. Several flights from April-October in western Arizona, southern Nevada, and the Mojave Desert.
Caterpillar Hosts: Besseya, penstemon, and Indian paintbrush (Scrophulariaceae); snowberry and honeysuckle (Caprifoliaceae); and plants from several other families including Boraginaceae and Rosaceae.
Adult Food: Flower nectar.
Habitat: Sagebrush flats, chaparral, desert hills, high prairie, open forest, alpine tundra.
Range: Alaska south along the Pacific Coast through California and Arizona to Baja California and Mexico; east to Montana, the Dakotas, Wyoming, Colorado, New Mexico.
Conservation: Some subspecies and unnamed populations may require monitoring, management, or preservation.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: Maintain habitat integrity, host plant colonies, and nectar sources. Note: This species used to include these additional separate species Euphydryas anicia, E. chalcedona, and E. colon.
Taxonomy Notes:
Images of Euphydryas chalcedona
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The map below displays all verified sighting records in the BAMONA database for this species. Each record is indicated with a yellow dot. The orange dots on the map provide access to information about the 400 most recently verified sightings of this species. In some instances, there are several records at the same location. Use the table view to access these records.
Instructions: Click on the map and move your mouse to pan.
Zoom by using the plus [+] and minus [-] on the left side of the map.
To change which map layers are displayed, click on the plus sign [+] on the right side of the map.
The fifty most recently verified sightings are below. See more recently verified sightings of all species.
| Observation Date | Submitter | Region |
Verified Date |
||
|---|---|---|---|---|---|
| January 01, 1950 | legacy.reporter | Alaska, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | La Paz County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Yuma County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Mohave County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Coconino County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Coconino County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Navajo County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Pinal County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Pima County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Yavapai County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Gila County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Maricopa County, Arizona, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Alameda County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Alpine County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Amador County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Butte County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Calaveras County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Colusa County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Contra Costa County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Del Norte County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | El Dorado County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Fresno County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Glenn County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Humboldt County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Inyo County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Kern County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Kings County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Lake County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Lassen County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Los Angeles County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Madera County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Marin County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Mariposa County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Mendocino County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Merced County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Modoc County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Mono County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Monterey County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Napa County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Nevada County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Orange County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Placer County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Plumas County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Riverside County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Sacramento County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Benito County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Bernardino County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Diego County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Francisco County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Joaquin County, California, United States | December 31, 2004 | Details |
