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 121 - 144 of 660 verified sightings
Observation date: Jul 14, 2018
Submitted by: Paul Prappas
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Nov 24, 2018
Observation date: Aug 15, 2013
Submitted by: J Rachwalski
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Nov 24, 2018
Observation date: Aug 12, 2017
Submitted by: J Rachwalski
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Nov 24, 2018
Observation date: Aug 02, 2017
Submitted by: J Rachwalski
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Nov 24, 2018
Observation date: Jul 28, 2018
Submitted by: J Rachwalski
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Nov 24, 2018
Observation date: Jul 19, 2018
Submitted by: DAEVK
Region: Bannock County, Idaho, United States
Verified by: stevekohler
Verified date: Oct 03, 2018
Observation date: Jul 19, 2018
Submitted by: DAEVK
Region: Bannock County, Idaho, United States
Verified by: stevekohler
Verified date: Oct 03, 2018
Observation date: Aug 08, 2018
Submitted by: Moongazer
Region: Judith Basin County, Montana, United States
Verified by: J_Martineau
Verified date: Aug 28, 2018
Observation date: Aug 06, 2018
Submitted by: Robert Gorman
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 19, 2018
Observation date: Aug 27, 2015
Submitted by: dlister
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 16, 2018
Observation date: Jul 14, 2018
Submitted by: Christian.Nunes
Region: Moffat County, Colorado, United States
Verified by: mikefisher
Verified date: Aug 13, 2018
Observation date: Jul 30, 2018
Submitted by: Lisahug
Region: Sierra County, California, United States
Verified by: Ken Davenport
Verified date: Aug 05, 2018
Observation date: Jul 30, 2018
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jul 31, 2018
Observation date: Jul 23, 2018
Submitted by: Jim and Debby
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 24, 2018
Observation date: Jul 13, 2018
Submitted by: Robert Gorman
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Jul 19, 2018
Observation date: Jul 13, 2018
Submitted by: Robert Gorman
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Jul 19, 2018
Observation date: Jul 06, 2018
Submitted by: MAKI
Region: Lassen County, California, United States
Verified by: Ken Davenport
Verified date: Jul 14, 2018
Observation date: Jul 09, 2018
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 13, 2018
Observation date: Jul 08, 2018
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 08, 2018
Observation date: Jun 17, 2018
Submitted by: Lisahug
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Jun 24, 2018
Observation date: Jul 22, 2008
Submitted by: hydapse
Region: Carbon County, Montana, United States
Verified by: stevekohler
Verified date: Jun 19, 2018
Observation date: Jul 11, 2016
Submitted by: donahilkey
Region: Rio Blanco County, Colorado, United States
Verified by: mikefisher
Verified date: Mar 07, 2018
Observation date: Jul 26, 2008
Submitted by: Lisahug
Region: Marin County, California, United States
Verified by: Ken Davenport
Verified date: Oct 08, 2017
Observation date: Aug 11, 2017
Submitted by: Claire Christensen
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Sep 22, 2017
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