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Wikipedia / Rhipicephalus

Rhipicephalus is a genus of hard ticks in the family Ixodidae, consisting of about 90 species. While many species are native to tropical Africa, the genus is cosmopolitan, being found across the world. Several species are vectors of significant human and animal pathogens.

Morphology

Rhipicephalus ticks are commonly called 'brown ticks' as they are mostly brown in colour. Most adult ticks in this genus do not have colour patterns on their scutum (inornate). Many taxa are very similar, without clear distinguishing features. Identification is often further frustrated by intraspecies variation. While males are reliably distinct, instar and female specimens are sometimes impossible to identify due to the lack of differential morphological features.

Disease potential

Rhipicephalus parasitism is of significant economic, medical, and veterinary importance. Many species are vectors of pathogens of humans and animals, including causing East Coast fever, anaplasmosis, babesiosis, rickettsiosis, Boutonneuse fever, Lyme disease, Q fever, Rocky Mountain spotted fever, NSDV and Crimean–Congo hemorrhagic fever. In addition to the infectious agents spread by ticks, tick bites can lead to allergic and toxic reactions.

Some species can cause tick paralysis by injecting a neurotoxin with their bite, such as Rhipicephalus evertsi and Rhipicephalus warburtoni.

Sex pheromone studies

A number of Rhipicephalus spp. females produce phenol and p-cresol after being fed for six days. These compounds may act as sex pheromones since these compounds were shown to be the sex pheromone of Rhipicephalus appendiculatus.

Etymology

The name Rhipicephalus is derived from the Greek word rhiphis, meaning "fan-like", and κεφαλή, kephalē, meaning "head". The two terms are related to the hexagonal basis capituli of Rhipicephalus.

Species

As of 2025, the genus contains 90 recognised species:

Unrecognised

Rhipicephalus sanguineus species complex

Rhipicephalus includes a clade centred around the brown dog tick, Rhipicephalus sanguineus. The taxonomy is currently in flux as phylogenies are developed. The species complex contains 16 known species-level lineages, but these often do not map singularly or wholly onto known species. Some species that are prima facie in the complex are yet to be sequenced:

  • R. afranicus Bakkes, 2020 - 'Afrotropical lineage'

  • R. camicasi Morel, Mouchet & Rodhain, 1976

  • R. guilhoni Morel & Vassiliades, 1963

  • R. leporis Pomerantsev, 1946

  • R. linnaei Audouin, 1826 - 'tropical lineage'

  • R. moucheti Morel, 1965

  • R. pumilio Schulze, 1935

  • R. pusillus Gil Collado, 1936

  • R. rossicus Yakimov & Kol-Yakimova, 1911

  • R. rutilus Koch, 1844 - 'southeastern European lineage'

  • R. sanguineus sensu stricto Latreille, 1806

  • R. schulzei Olenev 1929

  • R. secundus Feldman-Muhsam, 1952

  • R. sulcatus Neumann, 1908

  • R. turanicus Pomerantsev, 1936

Suspect

  • Rhipicephalus bergeoni Morel & Balis, 1976

  • Rhipicephalus hibericus Millán, Rodriguez-Pastor & Estrada-Peña, 2024

Subgenus Boophilus

Boophilus was once considered a separate genus, but studies in the early 2000s resulted in Boophilus being made a subgenus of Rhipicephalus. Although Boophilus has been included in the Rhipicephalus genus, their morphology is different from the typical Rhipicephalus species.

Notes

References

Further reading