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 |
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|---|---|---|---|---|---|
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April 18, 2013 | wimvdam | Santa Barbara County, California, United States | May 15, 2013 | Details |
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May 15, 2009 | Jamie Chavez | Santa Barbara County, California, United States | May 05, 2013 | Details |
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April 26, 2013 | Jamie Chavez | Santa Barbara County, California, United States | May 05, 2013 | Details |
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April 10, 2013 | MAKI | Santa Barbara County, California, United States | May 02, 2013 | Details |
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April 28, 2013 | vmcintee | Contra Costa County, California, United States | April 29, 2013 | Details |
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April 20, 2013 | kahunamcginty | Alameda County, California, United States | April 29, 2013 | Details |
| July 10, 1982 | legacy.reporter (K Hansen-S. Mattoon) | Elko County, Nevada, United States | December 01, 2012 | Details | |
| July 10, 1982 | legacy.reporter (K Hansen-S. Mattoon) | Elko County, Nevada, United States | December 01, 2012 | Details | |
| June 29, 1987 | legacy.reporter (George T. Austin) | Humboldt County, Nevada, United States | December 01, 2012 | Details | |
| July 11, 1995 | legacy.reporter (Robert L. Langston) | Douglas County, Nevada, United States | December 01, 2012 | Details | |
| July 10, 1995 | legacy.reporter (Robert L. Langston) | Storey County, Nevada, United States | December 01, 2012 | Details | |
| April 14, 1999 | legacy.reporter (Ray Stanford) | Navajo County, Arizona, United States | December 01, 2012 | Details | |
| March 14, 2004 | legacy.reporter (Mark Walker) | Maricopa County, Arizona, United States | December 01, 2012 | Details | |
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June 11, 2008 | mojoedevine | Alameda County, California, United States | August 22, 2012 | Details |
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May 28, 2012 | shakespearenut | Los Angeles County, California, United States | May 30, 2012 | Details |
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May 21, 2012 | evilrobot42 | Santa Clara County, California, United States | May 27, 2012 | Details |
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May 27, 2012 | Whitedolphinstar | Los Angeles County, California, United States | May 27, 2012 | Details |
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May 23, 2012 | Cabngirl | Sonoma County, California, United States | May 25, 2012 | Details |
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April 27, 2012 | cpohlson | Fresno County, California, United States | May 03, 2012 | Details |
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March 11, 2012 | AKimages | San Diego County, California, United States | March 20, 2012 | Details |
| May 28, 2012 | legacy.reporter (Ray Bruun) | Nevada, United States | January 01, 2012 | Details | |
| July 08, 1978 | legacy.reporter (George T. Austin) | Elko County, Nevada, United States | January 01, 2012 | Details | |
| March 21, 1976 | legacy.reporter (Ken Hansen) | Mohave County, Arizona, United States | January 01, 2012 | Details | |
| July 04, 1980 | legacy.reporter (George T. Austin) | Elko County, Nevada, United States | January 01, 2012 | Details | |
| August 19, 1979 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 15, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 08, 1977 | legacy.reporter (C. S. Lawson) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 15, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| May 03, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 12, 1978 | legacy.reporter (unknown) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 15, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 20, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| April 22, 1979 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
| May 12, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | January 01, 2012 | Details | |
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March 11, 2011 | RaisingButterflies.org | Clark County, Nevada, United States | October 19, 2011 | Details |
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April 25, 2010 | RaisingButterflies.org | Mohave County, Arizona, United States | October 19, 2011 | Details |
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July 22, 2011 | ABroadwell | San Mateo County, California, United States | July 29, 2011 | Details |
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June 05, 2011 | scheidr | Los Angeles County, California, United States | July 08, 2011 | Details |
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July 02, 2011 | Alamaden | Santa Clara County, California, United States | July 04, 2011 | Details |
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June 09, 2010 | FeatherBirdLady | Mendocino County, California, United States | June 08, 2011 | Details |
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May 30, 2011 | lizlotz | Sonoma County, California, United States | June 06, 2011 | Details |
| May 26, 1979 | legacy.reporter (Jim Brock) | Mono County, California, United States | May 01, 2011 | Details | |
| June 09, 1988 | legacy.reporter (Jim Brock) | Amador County, California, United States | May 01, 2011 | Details | |
| March 29, 1969 | legacy.reporter (John & Tom Emmel) | San Bernardino County, California, United States | May 01, 2011 | Details | |
| April 14, 1977 | legacy.reporter (unknown) | San Diego County, California, United States | May 01, 2011 | Details | |
| June 19, 1957 | legacy.reporter (unknown) | Los Angeles County, California, United States | May 01, 2011 | Details | |
| July 07, 1944 | legacy.reporter (unknown) | Calaveras County, California, United States | May 01, 2011 | Details | |
| July 30, 1963 | legacy.reporter (unknown) | El Dorado County, California, United States | May 01, 2011 | Details | |
| July 03, 1950 | legacy.reporter (unknown) | Fresno County, California, United States | May 01, 2011 | Details | |
| May 24, 1975 | legacy.reporter (unknown) | Sierra County, California, United States | May 01, 2011 | Details |
