SEM images of one radula from specimen sheltered on medium sandpaper (P 600). (A) Image of outermost part of radula (wear and digestive zone). (B–E) 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) Left wear zone. (D) Worn lateral teeth I and unworn central teeth. (E) First signs of wear on lateral teeth I, lateral teeth II, and marginal teeth. Scale bars: A = 200 μm, B–E = 100 μm.