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 598 verified sightings
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
Observation date: Jul 17, 2021
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jul 19, 2021
Observation date: Jul 09, 2021
Submitted by: icosahedron
Region: Marin County, California, United States
Verified by: Ken Davenport
Verified date: Jul 19, 2021
Observation date: Jul 02, 2021
Submitted by: Luna-Linuche.76
Region: Modoc County, California, United States
Verified by: Ken Davenport
Verified date: Jul 05, 2021
Observation date: Jul 02, 2021
Submitted by: weflybye
Region: Thurston County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 03, 2021
Observation date: Jun 26, 2021
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jun 27, 2021
Observation date: Jun 26, 2021
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jun 27, 2021
Observation date: Aug 06, 2016
Submitted by: Paul Prappas
Region: Wallowa County, Oregon, United States
Verified by: davidwdroppers
Verified date: Jun 17, 2021
Observation date: Jul 01, 2018
Submitted by: gasigr
Region: Crook County, Oregon, United States
Verified by: davidwdroppers
Verified date: Jun 17, 2021
Observation date: Jul 26, 2020
Submitted by: gasigr
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Mar 30, 2021
Observation date: Aug 19, 2019
Submitted by: pdxgene711
Region: Oregon, United States
Verified by: davidwdroppers
Verified date: Mar 28, 2021
Observation date: Jul 05, 2020
Submitted by: WYbutterflyer1
Region: Carbon County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 15, 2021
Observation date: Jul 10, 2020
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 07, 2021
Observation date: Jun 27, 2020
Submitted by: flusteredfly
Region: Blaine County, Idaho, United States
Verified by: stevekohler
Verified date: Feb 02, 2021
Observation date: Jul 02, 2013
Submitted by: dbryant562
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Sep 23, 2020
Observation date: Aug 25, 2020
Submitted by: Luna-Linuche.76
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 31, 2020
Observation date: Aug 17, 2020
Submitted by: Birder2
Region: Sherman County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 20, 2020
Observation date: Aug 13, 2020
Submitted by: Shearwater13
Region: Modoc County, California, United States
Verified by: Ken Davenport
Verified date: Aug 18, 2020
Observation date: Aug 09, 2020
Submitted by: falco1
Region: Spokane County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 10, 2020
Observation date: Jul 22, 2020
Submitted by: Shearwater13
Region: Modoc County, California, United States
Verified by: Ken Davenport
Verified date: Aug 01, 2020
Observation date: Aug 13, 2015
Submitted by: fitzspokane
Region: Spokane County, Washington, United States
Verified by: davidwdroppers
Verified date: Mar 03, 2020
Observation date: Jul 19, 2018
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Feb 06, 2020
Observation date: Jul 24, 2019
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Feb 06, 2020
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