Fig. 3

Relative rib length of female and male ricefishes in pelvic brooders and transfer brooders. The three pelvic brooding species and the four transfer brooding species were pooled, respectively; shown are the median relative rib length and the standard deviation. Relative rib length is calculated by dividing the length of each rib by the longest rib of the respective specimen. The grey line (R0) marks the position of the lateral process and the insertion of the pelvic fin rays at the pelvic girdle. Additional file 2: Fig. S1 shows data points per species