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.
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Verified Sightings
Displaying 1 - 24 of 634 verified sightings
Observation date: Mar 03, 2023
Submitted by: Cathieann0508
Region: Tehama County, California, United States
Verified by: Ken Davenport
Verified date: Mar 05, 2023
Observation date: Jul 09, 2022
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Feb 14, 2023
Observation date: Aug 05, 2021
Submitted by: NikkiM
Region: Sublette County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 14, 2023
Observation date: Jun 30, 2021
Submitted by: gasigr
Region: Wallowa County, Oregon, United States
Verified by: Ken Davenport
Verified date: Feb 07, 2023
Observation date: Jun 30, 2021
Submitted by: gasigr
Region: Wallowa County, Oregon, United States
Verified by: Ken Davenport
Verified date: Feb 07, 2023
Observation date: Jun 30, 2021
Submitted by: gasigr
Region: Wallowa County, Oregon, United States
Verified by: Ken Davenport
Verified date: Feb 07, 2023
Observation date: Aug 10, 2022
Submitted by: J_Martineau
Region:
Verified by: J_Martineau
Verified date: Dec 16, 2022
Observation date: Sep 05, 2022
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Nov 28, 2022
Observation date: Jul 06, 2022
Submitted by: cklindsey
Region: Walla Walla County, Washington, United States
Verified by: davidwdroppers
Verified date: Nov 03, 2022
Observation date: Sep 16, 2022
Submitted by: Dobber31
Region: Tuolumne County, California, United States
Verified by: Ken Davenport
Verified date: Oct 22, 2022
Observation date: Oct 04, 2022
Submitted by: Lori Bellis
Region: Nevada County, California, United States
Verified by: Ken Davenport
Verified date: Oct 07, 2022
Observation date: Sep 12, 2022
Submitted by: weflybye
Region: Jefferson County, Washington, United States
Verified by: davidwdroppers
Verified date: Sep 13, 2022
Observation date: Aug 19, 2022
Submitted by: Gtosher
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Sep 07, 2022
Observation date: Aug 11, 2022
Submitted by: cklindsey
Region: Walla Walla County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 20, 2022
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
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