DOI: 10.15468/gb3xfw
title: Nuovi idrobiidi freatobi e stigobi dell’Appennino Settentrionale in Piemonte, Liguria ed Emilia-Romagna (Gastropoda: Caenogastropoda: Hydrobiidae)

description: This dataset contains the digitized treatments in Plazi based on the original journal article Bodon, Marco, Cianfanelli, Simone (2022): Nuovi idrobiidi freatobi e stigobi dell’Appennino Settentrionale in Piemonte, Liguria ed Emilia-Romagna (Gastropoda: Caenogastropoda: Hydrobiidae). Natural History Sciences 9 (1): 17-50, DOI: 10.4081/nhs.2022.547, URL: http://dx.doi.org/10.4081/nhs.2022.547Abstract - Ne w phreatic and stygobitic hydrobiids from the Northern Apennines in Piedmont, Liguria and Emilia-Romagna (Gastropoda: Caenogastropoda: Hydrobiidae).Five ne w species of phreatic and stygobitic hydrobiids are here described for the Ligurian-Piedmontese and Emilian Apennines. T w o species belong to the genus Alzoniella: Alzoniella borberensis n. sp., endemic to the sub-basin of the Borbera and Spinti streams, and to the lo w er stretch of the Scrivia stream, in the province of Alessandria, and Alzoniella isoensis n. sp., limited to the middle course of the Scrivia stream and to the basin of the Polcevera stream, on the Tyrrhenian sector of the Genoa province. Three species belong to the genus Fissuria: Fissuria globosa n. sp., w idespread throughout the sub-basin of the Scrivia stream (Genoa and Alessandria provinces), as w ell as in other Apennine w atercourses of the provinces of Alessandria, Piacenza, Parma and Reggio Emilia; Fissuria varicosa n. sp., present in the same area of Alzoniella borberensis n. sp., but also found in the Nure and Arda streams (Piacenza province) and in the Stirone stream (Parma province), and Fissuria sossoi n. sp., limited to the sub-basin of the Stura di Ovada streams (Genoa province).The first species, assigned to the genus Alzoniella Giusti & Bodon 1984 based on its anatomical characters, has a shell w ith peristome detached from the last w horl, such as that of other phreatic species already kno w n for eastern Liguria and central Italy, but differs from these in the shorter shell. The shape of the shell of A. borberensis n. sp. resembles that of other crenal or stygobitic species, w idespread in northern Italy. A. isoensis n. sp., is very similar to A. borberensis, although the peristome is not sinuous superiorly on the outer edge of the shell, but differs sharply in the anatomical characters. The other taxa w ith valvatoid shells here described, can be ascribed to the genus Fissuria Boeters 1981 based on their anatomical characters, and sho w some peculiarities of the male genital tract that distinguish them from the other congeneric species so far kno w n for southern Europe. The three ne w species of Fissuria differ mainly in the characters of the shell, more or less globose in F. globosa n. sp., more conical in F. sossoi n. sp. and more flattened in F. varicosa n. sp.; the latter is also characterized by the presence of a marked varix behind the peristome. Altogether, these new species can be defined as phreatic, as they colonize groundwater near w atercourses; only A. isoensis n. sp. has a w ider ecology, as it also lives in karst ground w ater and ground w ater in rocks permeable by fracking.Museo di Storia Naturale dell’Università di Firenze, Sezione Zoologica de “La Specola” (S.M.A.), Via Romana 17, 50125 Firenze, Italia.E-mail: bodonm0@gmail.com* Corresponding author: simone.cianfanelli@unifi.it© 2021 Marco Bodon, Simone CianfanelliReceived for publication: 28 May 2021Accepted for publication: 2 November 2021Online publication: 29 March 2022The ground w ater in contact w ith the w atercourses hosts a taxocenosis composed of stygophile or stygobitic hydrobiids able to colonize different habitats, such as springs, karst ground w aters, or aquifers in permeable fractured rocks, but they also host very specialized taxa often limited to very restricted ranges. The fe w main biodiversity hotspots are especially distributed in north-eastern Italy, especially in Isonzo basin, in the sub-basin of the Scrivia stream bet w een Liguria and lo w er Piedmont, in eastern Liguria, in Tuscany and in a fe w other catchments of southern Italy, in medium-sized w atercourses w ith a suitable substrate. The main ecological, biogeographical and palaeogeographical factors that may have interacted in determining the speciation and the current distribution of this unique population, are then analysed.