Our “Index descriptus” represents a list of newly described organisms, most often new species, whose descriptions appear for the first time on the pages of Historia naturalis bulgarica. Currently contains 63 names. Geographically, these are from all over the world: Albania, Antarctica, Bulgaria, Burkina Faso, China, Cuba, France, Greece, Iceland, Madagascar, Mexico, Nepal, Nigeria, North Korea, Papua New Guinea, Tanzania, Tunisia, Turkey.
Georgiev, Schneppat & Dedov, 2022 — Bythinella fabiae n. sp., a new spring-snail species (Gastropoda: Rissooidea) from the Belasitsa Mountains, South-West Bulgaria