Breaking ground below: first troglobitic Circoniscus (Isopoda: Scleropactidae) from Southeastern Brazil

A new troglobitic species of the genus Circoniscus is described from Brazil. Circoniscus boitata sp. nov. is the first troglobitic species of the genus reported from Southeastern Brazil and is found in two caves within the Cavernas do Peruaçu National Park, in Minas Gerais state. Additionally, we provide the first identification key for the troglobitic species of Circoniscus, along with electron micrographs and ecological notes on the species and the conservation status of its habitat.