FIGURE 5 in Morphological and genetic variation in North Atlantic giant file clams, Acesta spp. (Bivalvia: Limidae), with description of a new cryptic species in the northwest Atlantic

FIGURE 5. Inside view of a right valve of Acesta excavata, showing morphological features, landmarks 1 to 5 and 58 semilandmarks (6 to 63) positioned where the lines from the superimposed comb intersect the shell margin.