Zerene Fritillary
Speyeria zerene (Boisduval, 1852)
Family: Nymphalidae
Subfamily: Heliconiinae
Identification: Upper surface of both wings tawny to red-brown with dark markings. Underside of hindwing has silvered or unsilvered marginal spots more triangular than those of Speyeria coronis.
Wing Span: 2 1/8 - 2 3/4 inches (5.4 - 7 cm).
Life History: Males patrol all day seeking females. Females may delay egg-laying until late summer. Eggs are laid on leaf litter near violets; unfed first-stage caterpillars overwinter on a silken mat. In the spring, caterpillars feed on leaves of violets.
Flight: One brood from mid-June to early September.
Caterpillar Hosts: Violets including Viola adunca, V. lobata, V. cuneata, V. nuttallii, and V. purpurea.
Adult Food:
Habitat: accelerated by increased recreational use and development of the coast. Speyeria zerene hippolyta is listed as T1 by The Nature Conservancy: Critically imperiled 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). The Myrtle's silverspot (subspecies myrtleae) and Behren's silverspot (subspecies behrensii) are listed by the United States Fish and Wildlife Service.
Range: Coastal British Columbia south and east to Montana, south to central California, Arizona, and New Mexico.
Conservation: The Oregon silverspot (subspecies hippolyta) is historically known from 17 locations along the Pacific Coast from southern Washington to central Oregon, but is now found in only 4 sites in Oregon.
NCGR:
Management Needs: Establish Critical Habitat areas where encroaching development and plants can be managed to preserve meadows where the caterpillar host plant (Viola adunca) grows.
Comments: NULL
Verified Sightings
Displaying 1 - 24 of 566 verified sightings
Observation date: Jul 25, 2019
Submitted by: ncrosbyrd
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Sep 05, 2019
Observation date: Jul 19, 2019
Submitted by: ncrosbyrd
Region: Fremont County, Wyoming, United States
Verified by: J_Martineau
Verified date: Sep 05, 2019
Observation date: Sep 02, 2019
Submitted by: EvSherr
Region: Deschutes County, Oregon, United States
Verified by: Ken Davenport
Verified date: Sep 03, 2019
Observation date: Aug 20, 2019
Submitted by: EvSherr
Region: Deschutes County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 21, 2019
Observation date: Aug 19, 2019
Submitted by: pdxgene711
Region: Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 20, 2019
Observation date: Aug 18, 2019
Submitted by: EvSherr
Region: Deschutes County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 18, 2019
Observation date: Aug 09, 2019
Submitted by: MAKI
Region: Mariposa County, California, United States
Verified by: Ken Davenport
Verified date: Aug 14, 2019
Observation date: Aug 09, 2019
Submitted by: EvSherr
Region: Deschutes County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 09, 2019
Observation date: Aug 04, 2019
Submitted by: gp
Region: Lane County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 06, 2019
Observation date: Aug 04, 2019
Submitted by: Team Kweeper
Region: Plumas County, California, United States
Verified by: Ken Davenport
Verified date: Aug 05, 2019
Observation date: Jul 28, 2019
Submitted by: MAKI
Region: Amador County, California, United States
Verified by: Ken Davenport
Verified date: Aug 03, 2019
Observation date: Jun 25, 2019
Submitted by: 4oclockwatch
Region: Jackson County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 02, 2019
Observation date: Jul 19, 2019
Submitted by: Lisahug
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jul 20, 2019
Observation date: Jul 04, 2019
Submitted by: ncrosbyrd
Region: Josephine County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 15, 2019
Observation date: Jun 29, 2019
Submitted by: ncrosbyrd
Region: Jackson County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 15, 2019
Observation date: Jun 28, 2019
Submitted by: ncrosbyrd
Region: Josephine County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 15, 2019
Observation date: Jul 12, 2019
Submitted by: DeerPark
Region: Thurston County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 13, 2019
Observation date: Jul 12, 2019
Submitted by: dlister
Region: Thurston County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 13, 2019
Observation date: Jul 02, 2019
Submitted by: Lisahug
Region: Sierra County, California, United States
Verified by: Ken Davenport
Verified date: Jul 10, 2019
Observation date: Jun 18, 2019
Submitted by: ezeemonee
Region: Trinity County, California, United States
Verified by: Ken Davenport
Verified date: Jun 27, 2019
Observation date: Jun 24, 2016
Submitted by: gasigr
Region: Shasta County, California, United States
Verified by: Ken Davenport
Verified date: Mar 08, 2019
Observation date: Jul 07, 2006
Submitted by: hydapse
Region: Park County, Wyoming, United States
Verified by: J_Martineau
Verified date: Mar 07, 2019
Observation date: Jul 22, 2018
Submitted by: gasigr
Region: Crook County, Oregon, United States
Verified by: Ken Davenport
Verified date: Mar 04, 2019
Observation date: Jul 22, 2018
Submitted by: gasigr
Region: Crook County, Oregon, United States
Verified by: Ken Davenport
Verified date: Mar 04, 2019
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