DNA Sequence Variation in Dermacentor hunteri and Estimated Phylogenies of Dermacentor spp. (Acari: Ixodidae) in the New World

Paul R. Crosbie, Walter M Boyce, Timothy C. Rodwell

Research output: Contribution to journalArticle

35 Scopus citations


The genus Dermacentor is represented by 12 species in the New World. We sequenced a 300-bp portion of the mitochondrial 16S ribosomal DNA gene for 28 individual ticks representing 9 of these species and analyzed their phylogenetic relationships. Maximum parsimony, distance (neighbor-joining), and maximum likelihood were all used to resolve tree topologies. Eleven specimens of Dermacentor hunteri Bishopp representing populations across the tick's entire geographic range showed negligible genetic variation, with only single base-pair differences between each of 5 haplotypes. We found high degrees of bootstrap support (66-86%) for monophyly of the genus, but variable support for monophyly of species within the genus. D. hunteri, D. occidentalis Marx, and D. variabilis (Say) each resolved as a monophyletic taxon (79-99% support). D. andersoni Stiles and D. parumapertus Neumann formed a paraphyletic clade (99% support). D. albipictus, Packard showed substantial intraspecific variation and warrants further investigation. D. imitans Warburton was distinct from all other Dermacentor spp. on all trees.

Original languageEnglish (US)
Pages (from-to)277-288
Number of pages12
JournalJournal of Medical Entomology
Issue number3
StatePublished - May 1998



  • Dermacentor
  • Mitochondrial 16S rDNA
  • New World
  • Phytogeny

ASJC Scopus subject areas

  • Insect Science
  • veterinary(all)

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