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Herein, we present a taxonomic revision of the genus    Polygyratia    Gray, 1847, with a new systematic placement in   Scolodontidae   and containing only the species    Polygyratia   polygyrata    (Born, 1778). We offer an updated morphological description and geographical distribution, based on museum specimens and occurrence data gathered from literature and online database iNaturalist. We synonymise    P.   charybdis    Mörch, 1852 with    P.   polygyrata   . The species is known only from Atlantic Forest areas in Bahia state, eastern Brazil. We exclude three other species from the genus    Polygyratia   , classifying them as:   Systrophia  ( Systrophia )  heligmoida   (d’Orbigny, 1835) and   S.  ( Entodina )  reyrei   (Souverbie, 1858), based on conchological features; and   S.  ( E. )  pollodonta   (d’Orbigny, 1835), though tentatively, based on scant published data. Finally, we present the first report of   S.  ( S. )  heligmoida   (d’Orbigny, 1835) from Brazil.

Taxonomy and distribution of enigmatic “helicoid” Polygyratia Gray, 1847 ( Gastropoda , Stylommatophora )