<div>Figure Legends</div><div><b>Figure 1.</b> Sex-specific body size data for seven species of
marine turtles based on a new, comprehensive literature review
(Supplementary Table 2). A. Male versus female carapace length for 36
populations of all seven species of marine turtles: green (green cross:<i>Chelonia mydas</i> ), loggerhead (dark grey circle: <i>Caretta
caretta</i> ), Kemp’s ridley (red diamond: <i>Lepidochelys kempii</i> ),
olive ridley (red square: <i>Lepidochelys olivacea</i> ), hawksbill
(orange inverted triangle: <i>Eretmochelys imbricata</i> ), flatback
(black cross: <i>Natator depressus</i> ) and leatherback (blue triangle:<i>Dermochelys coriacea</i> ). The red line is the 1:1 line, representing
the null hypothesis of no SSD. The blue line is the regression (male CL
= 0.38804 + 0.9611 (female CL); adj r<sup>2</sup>=0.96,
p&lt;0.0001), and the dotted lines are the 95% confidence
intervals. See text for statistical details. B. Mean adult body size of
the seven species of marine turtles with symbols as in Figure 1A. Number
in parentheses is the total sample size across all studies, and error
bars indicate 1 Standard Error (SE)</div><div><b>Figure 2.</b> Comparisons of SSD in marine (symbols as in Figure 1)
and non-marine (black open circles) aquatic turtles. A. Plot of female
to male carapace length of marine versus non-marine aquatic turtles. The
red line is the 1:1 line, representing the null hypothesis of no SSD.
The solid lines represent the linear regressions and the dotted lines
show the 95% confidence intervals. The regression for the marine
turtles (blue) is: male CL = -2.4647 + 1.0014 (female CL) adj
r<sup>2</sup>=0.99, p&lt;0.0001). The regression for the
non-marine turtles (black) is: male CL = 0.5345 + 0.7684 (female CL) adj
r<sup>2</sup>=0.78, p&lt;0.0001). See text and Table 1A
for statistical details. B. Comparison of Sexual Dimorphism Index
(SDI<sub>LGF</sub>) values for marine versus non-marine aquatic
turtles (symbols as Fig. 1, Fig. 2A). The vertical red line represents
the null hypothesis of no sexual dimorphism (SDI<sub>LGF</sub> =
0). See text and Table 1B for statistical details.</div><div>Data Accessibilty Statement</div><div>Three supplementary tables and a general description of the data mining
process are included as Appendix/Electronic Supplementary Materials.</div>