Figure 1.

Intra-specific variation in sperm length in A. gambiae and A. stephensi males. Experiment 1: there is significant intra-specific variation in sperm length among males in both A. gambiae and A. stephensi. The mean sperm length in testis A is strongly correlated with that in testis B in males of A. gambiae (n = 25 males) and A. stephensi (n = 17 males).