Validation of the taxon Ixodes aragaoi Fonseca (Acari: Ixodidae) based on morphological and molecular data

Autor(es)

Onofrio, Valeria C. ^{[1, 2]} ; Ramirez, Diego G. ^{[3, 4]} ; Giovanni, Dalton N. S. ^[1] ; Marcili, Arlei ^[3] ; Mangold, Atilio J. ^{[5, 6]} ; Venzal, Jose M. ^{[7, 8]} ; Mendonca, Ronaldo Z. ^[1] ; Labruna, Marcelo B. ^[3] ; Barros-Battesti, Darci M. ^[4]

Afiliação do(s) autor(es)

^[1] Inst Butantan, Lab Parasitol, BR-05503900 Sao Paulo - Brazil

^[2] Univ Santo Amaro, Curso Med Vet, BR-04829300 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Fac Med Vet & Zootecnia, Dept Med Vet Prevent & Saude Anim, BR-05508270 Sao Paulo - Brazil

^[4] Inst Butantan, Lab Especial Colecoes Zool, BR-05503900 Sao Paulo - Brazil

^[5] Inst Nacl Tecnol Agr, Estn Expt Agr Rafaela, RA-2300 Santa Fe - Argentina

^[6] Consejo Nacl Invest Cient & Tecn, RA-2300 Santa Fe - Argentina

^[7] Univ Republ Reg Norte, Fac Vet, Lab Vectores & Enfermedades Transmitidas, Salto - Uruguay

^[8] Univ Republ Reg Norte, Fac Vet, Dept Vet Parasitol, Salto - Uruguay

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; v. 3860, n. 4, p. 361-370, SEP 8 2014.
• Citações Web of Science: 5

Resumo

The species Ixodes aragaoi Fonseca was described as Ixodes ricinus aragaoi, and later placed in synonymy with Ixodes affinis. However, this synonymy was rejected and the subspecies was elevated to species, and named as I. aragaoi. Some researchers did not consider the validity of I. aragaoi and maintained the synonymy proposed until 1998 when I. aragaoi was revalidated, and it was suggested that Ixodes pararicinus could be a synonym. The aim of this study was to confirm the taxonomic validity of I. aragaoi by means of redescription of adults and molecular analysis. Morphological studies were performed by optical and scanning electron microscopy; types of I. aragaoi were compared with those of I. pararicinus from Argentina, and also with material of I. pararicinus from Uruguay and I. affinis from the United States. Mitochondrial 16S rDNA sequences were obtained for determining phylogenetic relationships based on maximum parsimony. Morphological and molecular differences between I. aragaoi, I. pararicinus from Argentina, and I. affinis confirm the validity of the first each of these species. The morphological similarities of I. pararicinus from Uruguay with I. aragaoi, and the small distance of nucleotide sequences between them, confirm that the Uruguayan ticks are in fact I. aragaoi and expand the geographical distribution of this species. Based on the specimens of Ixodes examined in the present study, from the same locality of the types of I. ricinus rochensis in Uruguay, we agree with the synonymy of this subspecies with I. aragaoi as previously reported. Finally, our analyses indicate that both I. aragaoi and Ixodes fuscipes, another South American tick species, belong to the I. ricinus complex, currently composed of 19 species. (AU)

• Processo FAPESP: 07/53314-1 - O gênero Ixodes (Acari: Ixodidae) na região neotropical: estudos morfológicos e moleculares
• Beneficiário: Valeria Castilho Onofrio
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 10/51875-9 - Síndrome Baggio-Yoshinari: investigação epidemiológica com vistas ao isolamento e caracterização do agente etiológico
• Beneficiário: Darci Moraes Barros-Battesti
• Modalidade de apoio: Auxílio à Pesquisa - Regular