Resumen de Biodiversidad y taxonomía de micromoluscos Punctoidea del sur de Brasil, con la descripción de una nueva especie de Radiodiscus de la Mata Atlántica (Mollusca, Gastropoda, Pulmonata)

Sergio Eduardo Miquel, Rina Ramírez, Willibaldo Thomé

• Biodiversity and taxonomy of punctoid micromollusks from southern Brazil, withdescription of a new species of Radiodiscus from the «Mata Atlántica» (Atlantic Rain Forest)(Mollusca, Gastropoda, Pulmonata). Species in Charopidae and Punctidae from the «Centro de Pesquisas eConservação da Natureza Pró-Mata (CPCN Pró-Mata)» (Brazil, Rio Grande do Sul) and Thiele’s collection arestudied. The native species Rotadiscus amancaezensis (Hidalgo, 1869), Radiodiscus cuprinus Fonseca & Thomé,2000, R. compactus (Suter, 1900) comb. nov., R. promatensis Miquel, Ramírez & Thomé, 2004, Lilloiconchasuperba (Thiele, 1927), L. zulmae Miquel, Ramírez & Thomé, 2004 comb. nov., L. gordurasensis (Thiele, 1927),and Radioconus pleurophorus (Moricand, 1846) comb. nov., and the probably exotic, Sinployea? goeldii (Thiele,1927) were present in the charopid samples from the CPCN Pró-Mata; punctids were represented by Paralaomaservilis (Shuttleworth, 1852) and Paralaoma sp. A new species of Charopidae is described: Radiodiscussanchicoensis sp. nov. It is a tiny shell with 75 to 60 axial ribs in the last whorl. The protoconch microsculptureof Lilloiconcha, Zilchogyra and Radioconus, with generic value, is studied, as well as their internal calcareousteeth. Several species and a genus (Lilloiconcha = Trochogyra) are places into synonymy. The actual presence ofsome Patagonian species in southern Brazil is discussed; the only charopid reported to be present in Patagoniaand Brazil is R. amancaezensis. R. sanchicoensis is the dominant species in the CPCN Pró-Mata, followed by R.cuprinus.