Attributes of Glaucopsyche lygdamus

Silvery Blue
Glaucopsyche lygdamus (Doubleday, 1841)

Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Upperside of male iridescent silvery blue with narrow dark borders; female darker blue with wide borders. Both sexes have white fringe. Underside gray-brown; both wings with row of white-ringed, round black spots. Subspecies xerces (Boisduval) and pseudoxerces Emmel and Emmel have large white spots with or without black centers.
Wing Span: 7/8 - 1 1/4 inches (2.2 - 3.2 cm).
Life History: Males patrol near the host plants for females. Eggs are laid singly on flower buds and young leaves of the host plants. Caterpillars feed on flowers, seedpods, and young leaves and are tended by ants. Chrysalids hibernate.
Flight: One flight from March-June at low elevations, June-August at high elevations.
Caterpillar Hosts: Astragalus, Lotus, Lupinus, Melilotus, Oxytropis, Lathyrus, Vicia, and other species in the pea family.
Adult Food: Nectar from flowers including Asteraceae.
Habitat: A variety of locations including open woods, coastal dunes, prairies, meadows, road edges, rocky moist woods, and brushy fields.
Range: Central Alaska south to southern California, Baja California, Arizona, New Mexico, and western Kansas. Along northern United States east to Nova Scotia and south to Georgia.
Conservation: Subspecies palosverdesensis is thought to be extinct. Its historic range and its hostplant Astragalus leucopsis in the Palos Verdes Hills in Los Angeles County, California is largely extirpated, but an additional population was discovered in nearby San Pedro. This subspecies has The Nature Conservancy rank of T1 - Critically imperiled globally because of extreme rarity (5 or fewer occurrences, or very few remaining individuals), or because of some factor of its biology making it especially vulnerable to extinction. (Critically endangered throughout its range). Subspecies xerces is TX - Presumed extinct. Subspecies pseudoxerces is rank T2.
NCGR:
Management Needs: Conserve all remaining habitat for the Palos Verdes Blue. Investigate status and conservation needs of subspecies pseudoxerces.
Taxonomy Notes:

Images of Glaucopsyche lygdamus

Click on an image to view full size and to see additional details.






Glaucopsyche lygdamus - Glaucopsyche-lygdamus-AWT-1.jpg

Glaucopsyche lygdamus - Glaucopsyche-lygdamus-AWT-1.jpg
Glaucopsyche lygdamus - Glaucopsyche-lygdamus-2-Queener-crop.jpg

Glaucopsyche lygdamus - Glaucopsyche-lygdamus-2-Queener-crop.jpg
Glaucopsyche lygdamus - Glaucopsyche-lygdamus-Queener-crop.jpg

Glaucopsyche lygdamus - Glaucopsyche-lygdamus-Queener-crop.jpg
Glaucopsyche lygdamus - Silvery-Blue-HollyGrant.jpg

Glaucopsyche lygdamus - Silvery-Blue-HollyGrant.jpg
Glaucopsyche lygdamus - 2857_81.jpg

Glaucopsyche lygdamus - 2857_81.jpg


The map below displays all BAMONA data for this species and has three different data layers:
1. All records (yellow dots)   2. Recently verified records (orange dots)*   3. US county records (purple)

How to use the map:
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 and turn on/off the data layers and base layers.

*The orange dots on the map provide access to information about the 400 most recently verified sightings of this species. Sometimes, there are several records at the same location. Use the table view to access these records.

By default, the fifty most recently verified sightings are below. Sort by Observation Date to see the most recent sightings, or filter the sightings by region to get a regional list.

See more recently verified sightings of all species.

You don't have Javascript enabled. Hover for more information! But don't worry: you can still use this web site! You have two options:
  • enable Javascript in your browser and then refresh this page, for a much enhanced experience.
  • click the Update button every time you want to update the selection.
Observation Date Submitter Region Verified Datesort icon
April 17, 2015 khazelbaker Idaho County, Idaho, United States September 20, 2016 Details
May 28, 2016 johngor Ontario, Canada September 07, 2016 Details
May 20, 2016 johngor Ontario, Canada September 05, 2016 Details
July 02, 2016 DizzyDor Manitoba, Canada August 19, 2016 Details
June 22, 2016 Paul Tavares Nova Scotia, Canada July 31, 2016 Details
July 24, 2016 PDunwiddie Pierce County, Washington, United States July 26, 2016 Details
June 08, 2016 janazak Yukon Territory, Canada June 21, 2016 Details
June 09, 2016 Mr Bill E-B Ontario, Canada June 12, 2016 Details
May 04, 2016 Sue Orlowski Spokane County, Washington, United States May 19, 2016 Details
May 06, 2016 bobscafe British Columbia, Canada May 13, 2016 Details
May 03, 2016 PDunwiddie Thurston County, Washington, United States May 10, 2016 Details
May 01, 2016 benphalan Benton County, Oregon, United States May 02, 2016 Details
April 23, 2016 Sue Orlowski Lincoln County, Washington, United States April 30, 2016 Details
May 24, 2015 bobscafe British Columbia, Canada April 25, 2016 Details
April 20, 2016 PDunwiddie Thurston County, Washington, United States April 21, 2016 Details
May 24, 2015 routledge_SaultCollege Chippewa County, Michigan, United States April 10, 2016 Details
April 05, 2016 philohela Clark County, Nevada, United States April 06, 2016 Details
May 14, 2014 M Kuhlman Missoula County, Montana, United States April 05, 2016 Details
March 26, 2016 ezeemonee Ventura County, California, United States March 27, 2016 Details
March 17, 2016 MAKI Ventura County, California, United States March 18, 2016 Details
July 12, 2015 ncrosbyrd Gunnison County, Colorado, United States March 09, 2016 Details
February 21, 2016 diwalks2 Orange County, California, United States February 23, 2016 Details
May 24, 2015 bobscafe British Columbia, Canada February 11, 2016 Details
May 27, 2015 bobscafe British Columbia, Canada February 11, 2016 Details
May 22, 2015 bobscafe British Columbia, Canada February 11, 2016 Details
March 19, 2015 Josiah Gilbert San Luis Obispo County, California, United States December 17, 2015 Details
April 03, 2015 Josiah Gilbert San Luis Obispo County, California, United States December 17, 2015 Details
April 16, 2015 Josiah Gilbert San Luis Obispo County, California, United States December 11, 2015 Details
June 14, 2015 J_Martineau Sheridan County, Wyoming, United States December 08, 2015 Details
April 30, 2014 Chris Carvalho Klickitat County, Washington, United States September 24, 2015 Details
June 19, 2015 ncrosbyrd Gunnison County, Colorado, United States September 18, 2015 Details
July 01, 2015 ColoradEO Boulder County, Colorado, United States September 14, 2015 Details
June 14, 2015 Robert Epstein Summit County, Colorado, United States September 12, 2015 Details
June 24, 2015 Paul Tavares Alberta, Canada August 16, 2015 Details
June 29, 2014 Blewis Glacier County, Montana, United States July 27, 2015 Details
May 23, 2015 shsater Boundary County, Idaho, United States July 27, 2015 Details
July 11, 2015 treichard Ontario, Canada July 20, 2015 Details
May 20, 2015 Paul Prappas British Columbia, Canada July 10, 2015 Details
June 20, 2015 rbuist Manitoba, Canada June 22, 2015 Details
June 19, 2015 BeaLaporte Ontario, Canada June 20, 2015 Details
June 17, 2015 Cherylee Black Ontario, Canada June 18, 2015 Details
June 17, 2015 Cherylee Black Ontario, Canada June 17, 2015 Details
June 04, 2015 janazak Yukon Territory, Canada June 16, 2015 Details
May 12, 2015 sh11 Ontario, Canada June 16, 2015 Details
June 11, 2015 Cherylee Black Ontario, Canada June 15, 2015 Details
June 06, 2015 BeaLaporte Ontario, Canada June 10, 2015 Details
June 03, 2015 BeaLaporte Ontario, Canada June 03, 2015 Details
May 31, 2015 alchem30 Saskatchewan, Canada May 31, 2015 Details
May 31, 2015 alchem30 Saskatchewan, Canada May 31, 2015 Details
May 29, 2015 Cherylee Black Ontario, Canada May 30, 2015 Details