Allometry of SSD in anurans. The linear (Model I) regression line (β) with 95% confidence interval (weak line) is shown for SSD. The thick grey line represents isometry, i.e. β = 1. Each dot represents one species based on the mean body size of males and females. A: SSD-size relationship for 39 species, Model I, β = 0.992; B: SSD-size relationship for 36 species with female-biased SSD, Model I, β = 0.967; C: SSD-size relationship for 36 species with female-biased SSD calculated from the phylogenetic tree in Figure3, using independent comparisons (Felsenstein; Garland et al.), Model I, β = 0.974).