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A taxonomical and ecological study was made on 264 samples of 12 species of ectoparasite ixodides collected on wild mammals from several natural regions of Paraná state, Brazil. These species of ticks as their hosts are listed by their identified evolutive forms and capture locations. A review of the early studies on the Ixodida from South Brazil is made considering the frequency of the parasite species on each host concerning the geographic distribution of such species. This paper is a contribution to the knowledge of the Ixodidae ectoparasites species of wild mammals in Brazil

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Amblyomma dissimile is a common ectoparasite of cold blooded animals and is an accidental ectoparasite of some wild mammals. Details of the biology of specimens from the State of Amapá were studied in the laboratory in a humidity chamber at an average environmental temperature of 19.5 degrees C, using Bufo marinus as host for the time in Brazil. We also report the first record of this species in the State of Minas Gerais.

Forty-four cricetid rodents belonging to four species from Paraná State, Brazil, were karyotyped and examined for ectoparasites. Thirteen species of ectoparasites, including five mites, one louse, and seven fleas, are recorded for the first time from Paraná. New host records are described for four species of mites, one sucking louse, and seven fleas.