Haplotype network diagram based on mitochondrial cox1 haplotypes of Spirometra erinaceieuropaei from: (A) Finland (current data), Latvia [1], Poland [7, 14], and Ukraine [14]; and (B) specifically for Finland and Latvia. The sizes of haplotypes are proportional to the number of samples. Codes denote haplotype identifiers detected in individuals from Finland. Each hatch mark represents a single mutation, while black dots symbolise intermediate missing or unsampled haplotypes.