Summary ³

The Bay Checkerspot, Euphydryas editha bayensis, is a butterfly endemic to the San Francisco Bay region of the U.S. state of California. It is a federally threatened species, as a subspecies of Euphydryas editha.

On San Bruno Mountain ⁴

Larvae feed on California Plantain (Plantago erecta) for oviposition and small larvae. Owl's Clover (Castilleja densiflorus) as a secondary host after the plantain dries. Historically only a small colony of this butterfly has been known from the San Bruno Mountains, but in recent years, the Bay Checkersot Butterfly has not been seen on the mountains. it may have been extirpated as a result of two major grass fires in the mid-1980's.

Sources and Credits

1. (c) Ingrid Taylar, some rights reserved (CC BY), http://www.flickr.com/photos/49503118795@N01/3574400506
2. (c) kqedquest, some rights reserved (CC BY-NC), https://www.flickr.com/photos/kqedquest/447852042/
3. Adapted by Scott Loarie from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Euphydryas_editha_bayensis
4. (c) Scott Loarie, some rights reserved (CC BY-SA)

More Info

• iNat taxon page
• Animal Diversity Web
• Biodiversity Heritage Library
• BOLD Systems BIN search
• BugGuide
• Butterflies and Moths of North America
• CalPhotos
• CUIC Insect Images
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• Moth Photographers Group
• NatureServe Explorer 2.0
• Pacific Northwest Moths

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