Terrestrial gastropods from Pedra Talhada Biological Reserve, Alagoas state, Brazil, with the description of a new species of Radiodiscus (Gastropoda: Charopidae)

A thorough collection effort recently took place at Pedra Talhada Biological Reserve (Reserva Biologica de Pedra Talhada, in Portuguese) in Alagoas state, one of the largest fragments of Atlantic Forest in northeastern Brazil. The expedition recovered hundreds of land snails and this material is fully reported and described herein. Forty-two species were found in the reserve (47 counting historical records), comprised mostly of stylommatophoran snails, although some species of Neritimorpha and Caenogastropoda were also found. Many of these species are recorded here for the first time from Alagoas state, extending the geographical range of some or filling distribution gaps of others. The genera Bothriopupa and Sterkia, both vertiginids, are reported here from Brazil for the first time. One important find is Megalobulimus cardosoi, which was deemed extinct in the IUCN Red List. Furthermore, a new species of Charopidae is described, Radiodiscus ubtaoi sp. nov. Despite being a reserve, signs of depredation were observed in Pedra Talhada by our team, underlining the urgency of strengthening and enforcing the protection of this area.