SEM images of one radula from specimen sheltered on rough sandpaper (P 180). (A) Image of outermost part of radula (wear and digestive zone). (B–G) Magnifications of same region as in (A). (B) Right wear zone with colored outlines of lateral teeth I (green), lateral teeth II (purple), and 15 inner marginal teeth (yellow; only marginal teeth that show signs of wear were colored). (C) Worn lateral teeth I and unworn central teeth. (D–E) Worn lateral teeth I, lateral teeth II, marginal teeth. (F) Slight signs of wear. (G) First signs of wear on lateral tooth I, lateral tooth II, and marginal teeth. Scale bars: A = 200 μm, B–G = 100 μm.