Fig. 1. Whole-body reconstructions of the three thresher shark species, showing the position of the red, aerobic locomotor muscle (RM) (red) and vertebral column (yellow). Top, the bigeye thresher, A. superciliosus (58 kg); middle, the pelagic thresher, A. pelagicus (56 kg); bottom, the common thresher, A. vulpinus (70 kg; modified from Bernal et al., 2003). Location of the transverse section through each species corresponds to the position of maximum RM area (see Fig. 2). Each reconstruction is accompanied by a cross-sectional image taken from the specimen (inset; RM in the left side has been color enhanced for clarity).