CYTB haplotype network for Santa Cruz region T. californicus. Each segment represents one nucleotide difference with non-synonymous changes indicated by an *. Size of circle indicates the number of haplotypes while the colors depict the sites from which these haplotypes come. Sites are shown on the network when more than two individuals from one site have the same haplotype. The haplotypes labeled I, II, and III are shared by three or more sites. Dashed lines surrounding some haplotypes are solely for visual clarity.