Figures 16–19.Protoconch and jaws of Calliostoma tupinamba holotype in SEM 16 Protoconch profile and apical view, scale bar = 100 µm 17–19. Jaws 17 Ventral view, scale bar = 500 µm 18 Ventral view of anterior edge, scale bar = 200 µm 19 Detail of anterior area, scale bar = 20 µm.