Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Bay Checkerspot (Euphydryas editha bayensis) is a federally threatened insect subspecies which is native to the U.S. State of California. Since the 1980s the population of checkerspots has been in serious decline. Because this particular subspecies is so well studied, the decline was quickly recognized leading to its federally threatened status relatively quickly in 1987. Recently, two authors have advocated a reclassification for this subspecies of the checkerspot common to western North America, Euphydryas editha. The classification, to Euphydryas editha editha, is for reasons of historical precedence; however, this has not been accepted by the scientific community.

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