First Documented Record of Sineancylus rosanae (Gutiérrez Gregoric, 2012) (Mollusca: Planorbidae: Ancylinae) in Southern Brazil

Abstract

Abstract: Sineancylus rosanae (Gutiérrez Gregoric, 2012) is a freshwater limpet that has its apex located along midline on the anterior side of shell, different from other species of Ancylinae. Previously, it was considered a species of Laevapex in the Brazilian states of Paraná and Rio Grande do Sul. Agudo-Padrón (2007) also mentioned Laevapex sp. without giving a precise locality or an image of the material in question. Therefore, it is unknown if this record was really a Laevapex species or a misidentified Sineancylus. Due to its rarity, limited distribution, and its peculiar characters, herein we provide a proper record of S. rosanae from the state of Paraná, Brazil, expanding its known distribution. A population of S. rosanae was discovered in the Ocoí River (municipality of Medianeira) attached to basalt stones in the middle of the river. The shells analyzed in this study closely fit the original description.