Fig. 2. Distribution of composite functional shape variables. (A) Aspect ratio of the pectoral fin. (B) First canonical variate of size-standardized span data. (C) First standardized moment of area (relative distance of center of fin area from fin base) of the pectoral fins. Value in are means ±2 S.E.M. The species represented by filled circles are ‘flappers’ while the species represented by open circles are ‘rowers.’ Sample sizes, N, are given in Table 1.