Figure 2.

Effect of mid-piece length on (a) number of helical gyres (n = 19 males, 87 sperm) in part 1 and (b) mitochondrial cross-section area and (c) mitochondrial helix volume (n = 10 males, 10 measures each) in part 2. Volumes were computed from mitochondrial cross-section areas and mean straightened helical length for each male. Grey data points represent individual sperm, diamond-shaped points represent mean values and the error bars represent the standard deviation for each male.