Fig. 1.

Phylogenetic tree of flea species based on the cox2 gene, obtained with the Tamura-Nei model. Sequences obtained in this study are indicated with red colour and bold GenBank accession numbers. After species names, the country and host of origin are shown, if known. A dashed line surrounds three phylogenetic clusters of Ctenocephalides felis, labelled with encircled capital letters (a to c). Branch lengths represent the number of substitutions per site inferred according to the scale shown