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One‐note samba: the biogeographical history of the relict Brazilian butterfly Elkalyce cogina

Biogeographically puzzling taxa represent an opportunity to understand the processes that have shaped current species distributions. The systematic placement and biogeographical history of Elkalyce cogina, a small lycaenid butterfly endemic to Brazil and neighbouring Argentina, are long‐standing puzzles. We use molecular tools and novel biogeographical and life history data to clarify the taxonomy and distribution of this butterfly.