SEM images of one radula from specimen sheltered on fine sandpaper (P 800). (A) Image of outermost part of the radula (wear and digestive zone). (B–D) Magnifications of same region as in (A). (B) Right wear zone with colored outlines of lateral teeth I (green), lateral teeth II (purple), and inner 15 marginal teeth (yellow; only marginal teeth that show signs of wear were colored). (C) First signs of wear on lateral tooth I, lateral tooth II, marginal teeth. (D) Left wear zone. Scale bars: A = 200 μm, B–D = 100 μm.