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Alessandro Hallgass

  • Biodiversity Journal, 7 (1): 093-102 - MONOGRAPH

    Alessandro Hallgass & Angelo Vannozzi
    Terrestrial gastropods (Mollusca Gastropoda) from Lepini Mountains (Latium, Italy): a first contribution

    ABSTRACT
    Lepini Mountains are a calcareous massif that forms the southern pre-Apennines of Latium (Italy), reaching a maximum altitude of 1536 m. Notwithstanding their central position and the low height reached, the malacofauna of Lepini Mountains has been long neglected and species composition was never reported so far. In this contribution, a preliminary investigation of the terrestrial gastropods (Mollusca Gastropoda) occurring in the Lepini Mountains is reported. At least 43 species are recorded. Several species already reported from Central Apennines occur. The most remarkable findings include a hitherto unrecorded population of Medora sp. (Clausiliidae) and the occurrence of two distinct forms ascribable to Jaminia quadridens s.l.

  • Biodiversity Journal, 5 (2): 151-164 - MONOGRAPH

    Alessandro Hallgass & Angelo Vannozzi
    The continental molluscs from Mount Circeo (Latium, Italy)
    Proceedings of the Seventh Malacological Pontine Meeting, October 5th-6th, 2013 - San Felice Circeo, Italy

    ABSTRACT
    This paper is the second step in a process that aims to asses biodiversity of land and freshwater molluscs fauna of Mount Circeo (Latium, Italy). Forty species of land and freshwater molluscs are listed, three more than in the previous work. A species of Oxychilus Fitzinger, 1833 and two species of Limax Linnaeus, 1758 remain undetermined, to date. The presence of Pleurodiscus balmei balmei (Potiez et Michaud, 1838) and Siciliaria gibbula honii (O. Boettger, 1879) are confirmed and this is the known northern limit of their distribution areas in Italy. Moreover, the presence of some species of biogeographical interest has allowed us to formulate some hypotheses on the origin of this fauna, in the light of the most recent theories on the formation of the Italian peninsula.