Giusti F., Lesicki A., Benocci A., Pieńkowska J. R., Manganelli G. 2021. Weltersia obscura, a new slug from the island of Montecristo (Tuscan Archipelago, Italy): a hitherto undiscovered endemic or a recent alien? (Mollusca, Pulmonata, Limacidae). Systematics and Biodiversity. 19(7): 648-64. doi:10.1080/14772000.2021.1908442