摘要：The main theme of the article is the systematic review of discinoids the Lower to Middle Devonian of the Ponta Grossa (latest Pragian to early Emsian) and São Domingos Formation (late Emsian to Frasnian), Paraná Basin, Paraná state, Brazil. Five discinoid species were recorded: Orbiculoidea baini, O. bodenbenderi, O. excentrica, Gigadiscina collis , and Rugadiscina stagona . The adopted the reallocation of Gigadiscina collis instead of Orbiculoidea collis, proposed by Mergl; Massa (2005), the maintenance of other species as well as new description data are accepted. Description of Rugadiscina stagona a new species of discinoid for the Devonian of the Paraná Basin.
关键词：Devoniano;Bacia do Paraná;Macroinvertebrados;Discinoideos
