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Published: 2022-08-05

Description of eight new species of Ixodes Latreille, 1795 (Acari: Ixodidae) and redescription of I. auritulus Neumann, 1904, parasites of birds in the Australasian, Nearctic and Neotropical Regions

United States National Tick Collection, the James H. Oliver, Jr. Institute for Coastal Plain Science, Georgia Southern University, Statesboro, Georgia 30460-8042, USA. Department of Biology, Georgia Southern University, Statesboro, Georgia 30460, USA 3Zoological Institute, Russian Academy of Sciences, St. Petersburg, 199034, Russia
Statesboro, Georgia 30458, USA
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA 6Institute of Environmental and Agricultural Biology (X-BIO), Tyumen State University, Tyumen, 625003, Russia
Department of Biology, Georgia Southern University, Statesboro, Georgia 30460, USA
Departamento de Investigación en Entomología Médica, Instituto Conmemorativo Gorgas de Estudios de la Salud, Panama City, Panama
Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine, University of São Paulo, São Paulo, SP 05508-270, Brazil
Department of Entomology, Biology Faculty, St. Petersburg State University, St. Petersburg, 199034, Russia
School of Chemistry and Molecular Biosciences, the University of Queensland, Queensland, 4072 Australia
Acari Ixodes systematics ticks


Ixodes brevisetosus n. sp. from Papua New Guinea, Ixodes contrarius n. sp. from Costa Rica, Ixodes guglielmonei n. sp. from Argentina and Chile, Ixodes insulae n. sp. from Australia, Ixodes moralesi n. sp. from Guatemala and Panama, Ixodes rio n. sp. from Brazil, Ixodes robbinsi n. sp. from Canada and the United States and Ixodes tinamou n. sp. from Peru (Acari: Ixodidae) are described based on females, nymphs and larvae from various avian hosts (Charadriiformes: Charadriidae; Falconiformes: Falconidae; Galliformes: Cracidae, Odontophoridae, Phasianidae; Passeriformes: Acanthizidae, Cardinalidae, Emberizidae, Fringillidae, Furnariidae, Melanocharitidae, Orthonychidae, Paridae, Passeridae, Petroicidae, Thamnophilidae, Troglodytidae, Turdidae; Strigiformes: Strigidae; Tinamiformes: Tinamidae) and a rodent (Rodentia: Muridae). Females, nymphs and larvae of all new species are similar to those of Ixodes auritulus Neumann, 1904, but can be distinguished by the shape of the scutum and basis capituli, relative length of idiosomal setae, auriculae and internal projection on palpal segment I, degree of development of dorsoapical and mesodorsal spurs on palpal segment I, and measurements and proportions of various structures. Females, nymphs and larvae of I. auritulus s. str. are redescribed based on specimens from passerine birds (Furnariidae, Troglodytidae, Turdidae) in Chile. The subspecies I. auritulus zealandicus Dumbleton, 1961 is elevated to species status, Ixodes zealandicus Dumbleton, 1961. Based on our extensive survey and morphological analyses, we evaluate the actual species richness in the I. auritulus species group and discuss future directions in the systematics of this group of ticks.



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