Figure 1.

Geographic distribution of mtDNA sequence variation of Cryptasterina pentagona (blue) and Cryptasterina hystera (red). Map units are in longitude and latitude. The haplotype network represents all the unique concatenated mtDNA sequences. Each sequence is represented by a circle with the size proportional to the frequency in all populations and colour-coded to match the sampling locations. Each line represents one mutational change between sequences. Hash marks are used when there is more than one mutational step between sequences. Site codes are as follows: BB, Bingil Bay; TV, Rowes Bay; BO, Bowen Beach; DB, Dingo Beach; AB, Airlie Beach; OTI, One Tree Island; SB, Statue Bay; SY, Yeppon. Full site names, and latitude and longitudes can be found in electronic supplementary material, Table S1.