Fig. 2From: Breeding system, shell size and age at sexual maturity affect sperm length in stylommatophoran gastropodsEffect of the breeding system on sperm length in gastropods. Phylogenetic effects and the influence of age at sexual maturity have been taken into account. Bars indicate mean values, whiskers standard errors. Different letters indicate significant differences between groups with different breeding systems (Tukey test, p-value adjusted following Westfall [115]). Sample sizes are 6, 13 and 38 from left to rightBack to article page