New faunistic data on Trochoidea (Trochoidea) caroni (Deshayes, 1832) (Gastropoda Pulmonata Hygromiidae)

Trochoidea (Trochoidea) caroni (Deshayes, 1832), with T. (T.) elegans (Gmelin, 1791) and T. (T.) trochlea (Pfeiffer, 1846), belong to a group of species (“elegans group”), which, although considered valid by most authors, show a not completely defined systematic position. In this work, we report four new records (Terracina and Spigno Saturnia for Latium, Sorrento for Campania and Castagneto Carducci for Tuscany) and confirm two historical records (Ischia Island for Campania and Manfredonia for Apulia) of T. caroni from Italy, and all published and new faunistic data about the presence of this species in the Sicilian Islands, Capri Island and Maltese Islands. Moreover, we report some historical data from the Western Mediterranean Sea: two bibliographical records from the Balearic Islands, not verified, and three records from North Africa (Tunis in Tunisia, Annaba in Algeria and an unmarked locality in Morocco). We also report the up to now historical faunistic data of T. trochlea, a not well known species with an undefined status, and of some populations of T. elegans with raised whorl. It is not yet possible to draw a certain conclusion on the particular biogeography of these taxa, but the new data presented in this work, enhance the current knowledge on the distribution of T. caroni which would be larger than previously known.