e Scaphopoda, a maior parte proveniente do sul do Brasil. As duas primeiras classes são as mais representativas, com 96% do total. A coleção possui 10.650 lotes tombados e 164.674 espécimes, com representantes de espécies endêmicas, invasoras e ameaçadas de extinção. Neste artigo apresentam-se informações gerais sobre a composição do acervo. Palavras-chave: Mollusca; malacofauna; Rio Grande do Sul.
ABSTRACTThe mollusks collection at the PUCRS Museum of Science and Technology has representatives of the classes Gastropoda, Bivalvia, Cephalopoda, Polyplacophora and Scaphopoda, mostly from the South of Brazil. The first two classes are the most heavily represented, comprising 96% of the catalogued lots. The collection comprises 10,650 lots and 164,674 specimens, and includes endemic, invasive and endangered species. An overview of the collection composition will be given.
ABSTRACT. A new species of Astyanax belonging to the Astyanax scabripinnis complex is described from dos Touros River, tributary of the Pelotas River, Uruguay River basin. Astyanax taurorum sp. nov. is distinguished from other species of the Astyanax scabripinnis species complex by having two humeral spots, the first vertically elongated; teeth of inner row of premaxilla with three to five cusps; 2-3 (modes 2 or 3) maxillary teeth; 20-23 (mode 22) branched anal-fin rays; 13-15 (mode 14) gill rakers on lower branch of the first branchial arch; 20-23 (mode 21) total gill rakers in first branchial arch; 33-36 (mode 35) perforated lateral line scales. Astyanax taurorum sp. nov. is similar to Astyanax paris; nevertheless, it can be readily distinguished from it by having a smaller head depth (73.6-83.1% vs. 86.4-95.6%) and smaller interorbital width (24.1-28.0%vs. 30.8-32.8%). In addition, it differs from A. paris by the presence a posttemporal hook-shaped posterodorsal margin.
Phenacogaster apletostigma sp. nov. distingue-se por apresentar uma grande mancha umeral verticalmente alongada que se estende desde a linha lateral até quase o dorso do corpo e apresenta um prolongamento na porção ântero-dorsal. Tanto a forma quanto o tamanho da mancha não são encontrados em nenhuma outra espécie do gênero e é aqui considerada uma autapomorfia da espécie. Habita o sistema do rio Araguari, no Estado do Amapá, Brasil.
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