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)

Abstract

Biodiversity and taxonomy of punctoid micromollusks from southern Brazil, with
description 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 e
Conservação da Natureza Pró-Mata (CPCN Pró-Mata)» (Brazil, Rio Grande do Sul) and Thiele’s collection are
studied. The native species Rotadiscus amancaezensis (Hidalgo, 1869), Radiodiscus cuprinus Fonseca & Thomé,
2000, R. compactus (Suter, 1900) comb. nov., R. promatensis Miquel, Ramírez & Thomé, 2004, Lilloiconcha
superba (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 Paralaoma
servilis (Shuttleworth, 1852) and Paralaoma sp. A new species of Charopidae is described: Radiodiscus
sanchicoensis sp. nov. It is a tiny shell with 75 to 60 axial ribs in the last whorl. The protoconch microsculpture
of Lilloiconcha, Zilchogyra and Radioconus, with generic value, is studied, as well as their internal calcareous
teeth. Several species and a genus (Lilloiconcha = Trochogyra) are places into synonymy. The actual presence of
some Patagonian species in southern Brazil is discussed; the only charopid reported to be present in Patagonia
and Brazil is R. amancaezensis. R. sanchicoensis is the dominant species in the CPCN Pró-Mata, followed by R.
cuprinus.