Abstract
A new geomitrid, Etruscotricha folcoi gen. et. sp. nov., discovered in the massif of Monte Calvi, Livorno province (Tuscany, Italy), is described. Number, shape and position of dart sacs suggested that the new taxon could belong to the genus Xerotricha. However, molecular data revealed that the new taxon is clearly differentiated from all other Geomitridae genera analysed, including Xerotricha. Etruscotricha folcoi gen. et. sp. nov. is a narrow range endemic species that is restricted to calcareous debris habitats with low and sparse vegetation.; its populations are scattered and living specimens are rarely found. Taking into account the available distribution and abundance data, as well as information on habitat quality, the risk category for E. folcoi gen. et. sp. nov. was determined by applying the criteria suggested by the International Union for the Conservation of Nature (IUCN) to support actions aimed at its conservation. Additionally, an updated list of the malacofauna present in the protected area of Monte Calvi is provided.
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