Full Length Research Paper
Abstract
The existence of a biological barrier between Rhipicephalus (Boophilus) microplus, Rhipicephalus (Boophilus) annulatus and Rhipicephalus (Boophilus) decoloratus, which are considered species within the subgenus Rhipicephalus (Boophilus), is increasingly questioned due to observed hypothetical hybridization among them. To investigate this presumed hybridization, we conducted a morphometric characterization study of the tick population in the Savannah District. Ticks were collected from 74 farms, with an average of 16 cattle per farm. These collected ticks were then preserved in 70° ethanol, identified using a binocular magnifying glass and an identification key, and subsequently subjected to morphometric analyses. Only non-engorged adult individuals within the subgenus Rhipicephalus (B.) were analyzed using classical morphometry. This study revealed the presence of sexual dimorphism within ticks of the subgenus Rhipicephalus (Boophilus), with Rhipicephalus (Boophilus) females exhibiting significantly larger linear characteristics than males. Furthermore, this study demonstrated variation in morphological traits between different species. Classical morphometry, however, did not allow for the distinction between males of one species and those of another. In contrast, it was possible to differentiate R. (B.) microplus females from females of other species.
Key words: Variation, morphology, morphometry, ticks, Rhipicephalus, Côte d’Ivoire
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