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In the present work, a comparative molecular study of Ctenocephalides felis and Ctenocephalides canis isolated from dogs (Canis lupus familiaris) from different geographical regions (Spain, Iran and South Africa) was carried out. We found morphological variations in C. felis that do not correspond with molecular differences. The Internal Transcribed Spacers 1 and 2 (ITS1, ITS2) and 18S rRNA partial...