Sphyrna leaeini (E. Griffith & C. H. Smith, 1834)

Gayford, Joel H, Whitehead, Darren A, Ketchum, James T & Field, Daniel J, 2023, The selective drivers of allometry in sharks (Chondrichthyes: Elasmobranchii), Zoological Journal of the Linnean Society 198 (1), pp. 257-277 : 263

Sphyrna leaeini (all classes)

Regression of 12 morphological measurements against PL in all S. leaeini individuals recovered seven cases of isometric growth and five cases of allometric growth ( Table 4 ). R 2 values varied from 0.39 (KC; Table 4 ) to 0.85 (EE; Table 4 ). The measurements PS, KC, UL, CH and EE all showed significant negative allometry ( Fig. 4 ; Table 4 ).

Sphyrna leaeini (class-specific)

Regression of 12 morphological measurements against PL in S. leaeini Class One individuals recovered five cases of isometric growth and seven cases of allometric growth ( Table 5 ). R 2 values varied from 0.16 (KC; Table 5 ) to 0.78 (UL; Table 5 ). The measurements FS, PS, KC, DL, UL, PF and EE all showed significant negative allometry ( Fig. 5 ; Table 5 ). Regression of 12 morphological measurements against PL in S. leaeini Class Two individuals recovered five cases of isometric growth and seven cases of allometric growth ( Table 6 ). R 2 values varied from 0.08 (KC and UL; Table 6 ) to 0.75 (EE; Table 6 ). The measurements LS, PS, KC, UL, LL, CH and EE all showed significant negative allometry ( Fig. 6 ; Table 6 ).

Figures

Figure 4. Linear regression plots for proximal span – PS (A), caudal keel circumference - KC (B), upper caudal lobe - UL (C), caudal height - CH (D) and cephalofoil diameter - EE (E) against precaudal length - PL for all S. leaeini data. All data are log10 transformed, and the 95% confidence interval for the scaling coefficient is represented by the dark-grey area.

Figure 5. Linear regression plots for frontal span - FS (A), proximal span - PS (B), caudal keel circumference - KC (C), dorsal fin height - DL (D), upper caudal lobe - UL (E), pectoral fin length - PF (F) and cephalofoil diameter - EE (G) against precaudal length - PL for S. leaeini Class One data. All data are log10 transformed, and the 95% confidence interval for the scaling coefficient is represented by the dark-grey area.

Figure 6. Linear regression plots for proximal span - PS (A), frontal span - FS (B), caudal keel circumference - KC (C), upper caudal lobe - UL (D), lower caudal lobe - LL (E) and cephalofoil diameter - EE (F) against precaudal length - PL for S. leaeini Class Two data. All data are log10 transformed, and the 95% confidence interval for the scaling coefficient is represented by the dark-grey area.