FIGURES 18–20 in Monographic revision of the endemic Helix mazzullii De Cristofori & Jan, 1832 complex from Sicily and re-introduction of the genus Erctella Monterosato, 1894 (Pulmonata, Stylommatophora, Helicidae)

FIGURES 18–20. Erctella insolida samples from several sites of the Trapani province showing different morphotypes. Each shell shown in frontal (a) and dorsal (b) view. 18. San Vito lo Capo, Cala Mancina, height (H): 34 mm, maximum diameter (D): 30 mm. 19. Custonaci, Monte S. Giovanni, H: 37 mm, D: 34 mm. 20. San Vito lo Capo, Monte Passo del Lupo, H: 40 mm, D: 37 mm.