The dilemma of choosing a reference character for measuring sexual size dimorphism, sexual body component dimorphism, and character scaling: cryptic dimorphism and allometry in the scorpion Hadrurus arizonensis Fox, G.A.; Cooper, A.M.; Hayes, W.K. Plos one 10(3): E0120392 2015 https://eurekamag.com/research/059/053/059053862.php