Lista preliminar de los Punctoideos de Rio Grande do Sul, Brasil, con description de dos espedes nuevas (MoIIusca, Gastropoda, Stylommatophora)

摘要

The partial list of the land snails Punctoidea from the "Centra de Pesquisas e Conservacao da Nanireza Pro-Mata" [Sao Francisco de Paula, State of Rio Grande do Sul, Brazil) (CPCN-PM) is presented herein.This list includes seven species, two of them new.The CPCN-PM is located between 600 and 950 m of altitude; it has a temperate super humid to humid climate, with 2,250 mm of annual rainfall and means annual temperature of 14.5°C; three main phytoecological regions are present -mixed ombrophile forest, dense ombrophile forest and savanna.The taxa found are: Rotadiscus amancaeiensls (Hidalgo, 1869), Lllloiconcha tucumana {Hylton Scott, 1963), Radiodiscus cuprlnus Fonseca K Thome, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927) and Zilchogyra wlmae sp. nov. The shell of ft promatensis sp. nov. is very small, almost flat, with very wide umbilicus, reniform aperture, teleoconch with spiral striae and 58-62 axial ribs on the body whorl.The shell of Z. uilmaesp. nov. is trochiform elevated, with five whorls with strong and widely spaced axial ribs (25-38), wide and perspective umbilicus and sub circular angled aperture. The charopid gastropod fauna from the CPCN-PM has three species known only from there (ft cuprinus,R. promatensis sp. nov. and Z. zulmae sp. nov.),another one with previous known distribution only in Paraguay (ft tenellus) and three common species (L tucumana, R. amancaeiensis and Z. gordurasensis) with distribution in other South American areas -mainly Yungas forests.