Fig. 4. Endurance of Tupinambis merianae with intact post-hepatic septum (PHS) (grey boxes) and with surgically removed PHS (white boxes) at 0.17 and 0.28 m s^-1. The lower boundary of a box indicates the 25^th percentile, the solid line within the box marks the median, and the upper boundary of the box indicates the 75^th percentile. Error bars above and below the box indicate the 90^th and 10^th percentiles. Means are presented as stippled lines and outliers as solid points. ^*Significant difference (P0.05) between 0.17 and 0.28 m s^-1 in a group of tegus.