Integrative taxonomy and species delimitation of Rhipicephalus turanicus (Acari: Ixodida: Ixodidae)

[Display omitted] •A new African tick species is described that was previously considered part of Rhipicephalus turanicus in the Palearctic.•Past research has shown it can interbreed with a related species, despite differences in morphological and molecular data.•Speciation likely occurred recently...

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Veröffentlicht in:International journal for parasitology 2020-07, Vol.50 (8), p.577-594
Hauptverfasser: Bakkes, Deon K., Chitimia-Dobler, Lidia, Matloa, Dikeledi, Oosthuysen, Morné, Mumcuoglu, Kosta Y., Mans, Ben J., Matthee, Conrad A.
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Sprache:eng
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Zusammenfassung:[Display omitted] •A new African tick species is described that was previously considered part of Rhipicephalus turanicus in the Palearctic.•Past research has shown it can interbreed with a related species, despite differences in morphological and molecular data.•Speciation likely occurred recently via allopatry as a result of Sahara desert expansion about 7 million years ago.•Hybridization potential was likely driven by fluctuating divergence and re-integration due to oscillating climate history.•This is the first application of geometric morphometrics to determine character shape differences between species of ticks. Rhipicephalus turanicus ticks are widely distributed across the Palearctic and Afrotropics. These two continental populations display differences in morphological characters that raise the question of a potential species boundary. However, the taxonomic status of these morphologically divergent lineages is uncertain because R. turanicus from Cyprus and Zambia have been shown to interbreed and produce fertile hybrids. We employ integrative taxonomy that considers data from mtDNA sequences (12S and 16S rDNA), geographic distribution, traditional (qualitative) morphology, as well as shape outlines of female spiracles and male adanal plates measured in a geometric morphometric framework (quantitative morphology) to resolve this taxonomic issue. Molecular lines of evidence (12S and 16S rDNA) support taxonomic separation between ticks sampled in the Afrotropics and the Palearctic. This is corroborated by qualitative and quantitative morphology. Within the Palearctic, two sub-lineages were recovered based on sequence data that loosely correspond to southern Europe and the Middle East/Asia. One new species, Rhipicephalus afranicus n. sp. is described from South Africa with a geographic distribution that extends into eastern Africa. This leaves R. turanicus sensu lato comprised of two lineages located in southern Europe and the Middle East/Asia. The type locality for R. turanicus is in Uzbekistan, thus the Middle East/Asia lineage is considered R. turanicus sensu stricto. Detailed descriptions are provided for R. afranicus n. sp. and R. turanicus sensu stricto together with high resolution images. Speciation is attributed to recent Sahara desert expansion that formed a natural barrier to dispersal approximately 5–7 million years ago. However, reproductive potential between these two species suggests that divergence time and mode of speciation were no
ISSN:0020-7519
1879-0135
DOI:10.1016/j.ijpara.2020.04.005