Dos-passos-1938
Guides
Euphydryas chalcedona klotsi
Euphydryas chalcedona klotsi is a subspecies of the variable checkerspot butterfly described by dos Passos in 1938. It belongs to the family Nymphalidae and is currently treated as a synonym of Occidryas chalcedona in some taxonomic databases, reflecting ongoing taxonomic revision in the Euphydryas genus complex. The broader species Euphydryas chalcedona is known to exhibit significant population declines in western North America, with climate change identified as a major contributing factor.