Tag Archives: Speyeria

Speyeria callippe ssp. ‘Willamette’

Willamette Fritillary (Speyeria callippe ssp.)

The Willamette Fritillary is an undescribed subspecies of the Callippe Fritillary (Speyeria callippe (Boisduval)) that apparently was restricted to the Willamette Valley in northwestern Oregon, USA.

The form is now considered extinct.

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edited: 13.09.2019

Speyeria adiaste ssp. atossa (W. H. Edwards)

Atossa Fritillary (Speyeria adiaste ssp. atossa)  

The Atossa Fritillary, also known as the Unsilvered Fritillary, was described in 1890, originally as a full species, it was restricted to an area approximately at the borders between the three counties of Kern, Los Angeles and Ventura in southern California, USA.   

The adult butterflies were found in open canyons wherever water was present, they were attracted by many wildflowers, but seemed to have had a special preference for the flowers of the California Buckeye (Aesculus californica (Spach) Nutt.). The larval food plant was a violet species, yet the exact species was apparently never properly recorded but is suspected to might have been the Oakwoods Violet (Viola purpurea ssp. quercetorum (M. S. Baker & J. C. Clausen) R. J. Little).  

The Atossa Fritillary was last recorded in 1959 when two specimens were collected, respectively in 1960 when a last individual was spotted on the peak of Mt. Pinos in the Los Padres National Forest on the boundary between Kern – and Ventura counties.   

There have been many field searches since the last sightings, yet all of them were unsuccessful, the Atossa Fritillary is extinct. [1]  

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References:  

[1] Larry J. Orsak: Project Atossa – Preliminary report. Atala 2(2): 5-8. 1974  

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males on the right and in the middle, female on the right  

Depiction from: ‘Willian H. Edwards: The Butterflies of North America. Boston: Houghton, Mifflin 1884-88’  

(not in copyright)

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edited: 13.09.2019

Speyeria zerene ssp. myrtleae dos Passos & Grey

Myrtle’s Fritillary (Speyeria zerene ssp. myrtleae)

Myrtle’s Fritillary, also known Myrtle’s Silverspot, a subspecies of the Zerene Fritillary (Speyeria zereneSwainson) (see photo), was described in 1945, it was restricted to Pescadero Point in San Mateo County in California, USA.

The larvae are known to have fed on the Hookedspur Violet (Viola adunca Sm.).

Myrtle’s Fritillary was apparently last recorded around 1919 and is now considered extinct.

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The taxonomic situation of this form, however, is not finally solved and thus it might be identical with another form, the Point Reyes Fritillary (Speyeria zerene ssp. puntareyes Emmel & Emmel), which is restricted to the southernmost Sonoma County of california, and which itself is highly threatened.

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Zerene Fritillary (Speyeria zerene Swainson); nominate form

Depiction from: ‘Willian H. Edwards: The Butterflies of North America. Boston: Houghton, Mifflin 1884-88’   

(not in copyright)

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edited: 03.10.2020