Análisis de la estructura secundaria del LSU rRNA mitocondrial de caracoles terrestres peruanos (Orthalicidae: Gastropoda)

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.

Biodiversidad y endemismo de los caracoles terrestres Megalobulimus y Systrophia en la Amazonia occidental

Apple snails of the genus Pomacea Perry, 1810 (Mollusca: Caenogastropoda: Ampullariidae) are native to the Neotropics and exhibit high species diversity, holding cultural and ecological significance as an important protein source in Peru. However, most genetic studies in Pomacea have focused mostly on invasive species, especially in Southeast Asia, where they are considered important pests. In this study, we assembled and annotated the mitochondrial genomes of two Pomacea species native to the Peruvian Amazon: Pomacea reevei Ampuero & Ramírez, 2023 and Pomacea aulanieri (Deville & Hupé, 1850). The mitogenomes of P. reevei and P. aulanieri comprise 15,660 and 16,096 bp, respectively, and contain the typical 37 genes of the animal mitochondria with a large control region of 292 bp in P. reevei and 524 bp in P. aulanieri—which fall within the range of what is currently known in Pomacea. Comparisons with previously published mitogenomes in Pomacea revealed differences in the overlapping of adjacent genes, the size of certain protein-coding genes (PCGs) and the secondary structure of some tRNAs that are consistent with the phylogenetic relationships between these species. These findings provide valuable insights into the systematics and genomics of the genus Pomacea.