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The family Ctenophthalmidae (Order Siphonaptera) has been considered as a ‘catchall’ for a wide range of divergent taxa showing a paraphyletic origin. In turn, Ctenophthalmus sp. (Ctenophthalmidae) includes 300 valid described taxa. Within this genus, males are easily distinguishable basing on the size, shape, and chaetotaxy of their genitalia; however, females show slight morphological differences with each other. The main objective of this work was to carry out a comparative morphometric, phylogenetic, and molecular study of two different subspecies: Ctenophthalmus baeticus boisseauorum and Ctenophthalmus apertus allani in order to clarify and discuss its taxonomic status. From a morphological and biometrical point of view, we found clear differences between modified abdominal segments of males of both subspecies and slight differences in the margin of sternum VII of all female specimens which did …