Figure 18 in Morphometrics: History, development methods and prospects

Figure 18. Equally-spaced boundary outline semilandmark coordinate representations of Thompson's Argyoplecus and Sternoptyx images using 50-point and 150-point sampling schemes. White icons represent every 10th semilandmark in the 50-point outline sequence and every 25th semilandmark in the 150-point outline sequence. Note how the detail of the outlines present in the original drawings has been smoothed in both schemes. Nevertheless, the representational quality is much greater in both schemes than for the landmark sample scheme shown in Fig. 5B. Note also that the level of mismatch between comparable points in both semilandmark sequences, with respect to biologically homologous structures, is remarkably good, though there is an obvious mismatch of points between these two outlines in the dorsal fin of the 150-point sampling scheme.