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
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Verified Sightings
Displaying 1 - 24 of 620 verified sightings
Observation date: Jul 23, 2022
Submitted by: Luna-Linuche.76
Region: Lake County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 26, 2022
Observation date: Jul 21, 2022
Submitted by: Logan Miederhoff
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2022
Observation date: Jul 08, 2022
Submitted by: icosahedron
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2022
Observation date: Jul 09, 2022
Submitted by: robertpb
Region: Fresno County, California, United States
Verified by: Ken Davenport
Verified date: Jul 12, 2022
Observation date: Aug 17, 2011
Submitted by: colletteg
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Jul 04, 2022
Observation date: Jun 19, 2022
Submitted by: asabspade
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 22, 2022
Observation date: Jul 16, 2021
Submitted by: Christian.Nunes
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Dec 29, 2021
Observation date: Jul 03, 2021
Submitted by: mongoose
Region: Whitman County, Washington, United States
Verified by: davidwdroppers
Verified date: Dec 26, 2021
Observation date: Sep 05, 2021
Submitted by: timhood
Region: Salt Lake County, Utah, United States
Verified by: RaisingButterfl...
Verified date: Dec 16, 2021
Observation date: Jul 15, 2021
Submitted by: J_Martineau
Region: Lincoln County, Wyoming, United States
Verified by: J_Martineau
Verified date: Dec 09, 2021
Observation date: Jul 05, 2021
Submitted by: J_Martineau
Region: Okanogan County, Washington, United States
Verified by: J_Martineau
Verified date: Dec 03, 2021
Observation date: Aug 06, 2017
Submitted by: Mark Salvato
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Nov 18, 2021
Observation date: Jul 31, 2017
Submitted by: Mark Salvato
Region: Tuolumne County, California, United States
Verified by: Ken Davenport
Verified date: Nov 18, 2021
Observation date: Sep 17, 2021
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Oct 13, 2021
Observation date: Jul 10, 2021
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Oct 11, 2021
Observation date: Jul 02, 2021
Submitted by: hiker96
Region: Thurston County, Washington, United States
Verified by: davidwdroppers
Verified date: Oct 06, 2021
Observation date: Aug 12, 2021
Submitted by: WYbutterflyer1
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Aug 12, 2021
Submitted by: WYbutterflyer1
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Aug 12, 2021
Submitted by: WYbutterflyer1
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Aug 13, 2021
Submitted by: WYbutterflyer1
Region: Sublette County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Aug 13, 2021
Submitted by: WYbutterflyer1
Region: Sublette County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Aug 13, 2021
Submitted by: WYbutterflyer1
Region: Sublette County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 21, 2021
Observation date: Jul 23, 2021
Submitted by: asabspade
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jul 23, 2021
Observation date: Jul 23, 2021
Submitted by: asabspade
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jul 23, 2021
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