Phylogenetic and morphological study of the genus Potamolithus (Truncatelloidea: Tateidae) in hotspots of diversity at the Paranaense Forest, Argentina, with the addition of six new species

Análisis del impacto del vertido de efluentes urbanos sobre la malacofauna en un río de la Patagonia Austral (Santa Cruz, Argentina), a través de estudios de campo y bioensayos de laboratorio

“…Para el caso de H. hatcheri y M. patagonicum, los resultados obtenidos en este estudio coinciden con las valoraciones de sensibilidad/tolerancia planteados en los principales índices de calidad biótica utilizados en Argentina (Fernández et al, 2002;Miserendino & Pizzolón, 1999;Prat et al, 2009;Rodrigues Capítulo et al, 2001), siendo clasificados como grupos taxonómicos tolerantes a las alteraciones ambientales. Sin embargo, los estudios de estos grupos se han centrado principalmente en su sistemática y patrones de distribución (Cazzaniga, 2011;de Lucía et al, 2021;Fuentealba-Jara et al, 2017;Ituarte, 2009Ituarte, , 2020Parada et al, 2009), por lo que son necesarios nuevos estudios para comparar los resultados obtenidos. Los resultados de los ensayos realizados en el presente estudio mostraron que la exposición a baja concentración de efluente (10%) tuvo un efecto positivo sobre el crecimiento y la talla final de P. diaphanus, no observándose cambios significativos sobre la supervivencia con respecto al control.…”

Phylogeography and molecular species delimitation reveal cryptic diversity in Potamolithus (Caenogastropoda: Tateidae) of the southwest basin of the Andes

“…Potamolithus australis and P. santiagensis were described in the same article 36 , and partly on the same sheet, using characters from the external shell morphology and operculum, which are not entirely clear, despite they were described in different genera. Although these species have not been evaluated until now with independent morphological evidence, recent phylogenetic analyses based on COI sequences performed with samples of P. australis from Puerto Chico and P. santiagensis from El Yeso showed that they are different species 42 , 57 , 65 . Three methods of species delimitation in the present study identified these morphologically cryptic taxa as separate units, with P. santiagensis covering from Valparaíso Region to Tierra del Fuego in southern Patagonia, including Chiloé Island.…”

“…Tateid snails were traditionally included in the family Amnicolidae Tryon, 1863 35 , Hydrobiidae Troschel, 1857 39 or Lithoglyphidae Troschel, 1857 37 , 40 , revealing inconsistencies in the classification; the monophyly of the Tateidae was recovered by Wilke et al 41 . Two native genera of this family have been recognized in South America, Potamolithus Pilsbry, 1896, which contains about 47 species 42 , and the monospecific genus Strobellitatea Cazzaniga, 2017 43 . A third genus is Potamopyrgus Stimpson, 1865, represented in Chile by the invasive species Potamopyrgus antipodarum (Gray, 1843) 44 .…”