Morphological, biometrical, and molecular characterization of Ctenocephalides felis and Ctenocephalides canis isolated from dogs from different geographical regions.

In the present work, a comparative morphological, biometrical and molecular study of Ctenocephalides spp. isolated from dogs (Canis lupus familiaris) from different geographical regions (Spain, Iran, and South Africa) has been carried out. The internal transcribed spacer 1 (ITS1) sequences of Ctenocephalides felis and Ctenocephalides canis collected from dogs from different geographical regions have been determined to clarify the taxonomic status of these species and to assess intraspecific variation and interspecific sequence differences. In addition, a phylogenetic analysis based on ITS1 sequences has been performed. Four different morphological populations were observed in the individuals of C. felis collected from dogs from different geographical locations. Nevertheless, the comparative study of the ITS1 sequences of the different morphological populations observed in C. felis did not show molecular differences. The results showed clear molecular differences between C. felis and C. canis and some specific recognition sites for endonucleases were detected between both species. Thus, BfrBI and DraI sites have diagnostic value for specific determination in C. felis. The phylogenetic tree based on the ITS1 sequences of C. felis and C. canis revealed that all the populations of C. felis from different geographical regions clustered together and separated, with high bootstrap values, from C. canis. We conclude that ITS1 region is a useful tool to approach different taxonomic and phylogenetic questions in Ctenocephalides species.