Amblyomma - www.cbpv.com.br/rbpv Rev. Bras. Parasitol....

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Unformatted text preview: www.cbpv.com.br/rbpv Rev. Bras. Parasitol. Vet., Jaboticabal, v. 18, n. 3, p. 15-21, jul.-set. 2009 * Corresponding author: Gustavo Seron Sanches Departamento de Biologia, Instituto de Biocincias, Universidade Estadual Paulista UNESP Av. 24 A, 1515, CEP 13506-900 Rio Claro - SP, Brasil; e-mail: micm@rc.unesp.br Supported by: FAPESP (Project 2007/52046-3) Morphological description of Amblyomma brasiliense Arago, 1908 (Acari: Ixodidae) larvae and nymphs Descrio morfolgica de larvas e ninfas de Amblyomma brasiliense Arago, 1908 (Acari: Ixodidae) Gustavo Seron Sanches 1 *; Gervsio Henrique Bechara 2 ; Maria I. Camargo-Mathias 1 1 Departamento de Biologia, Instituto de Biocincias, Universidade Estadual Paulista UNESP 2 Departamento de Patologia Veterinria, Faculdade de Cincias Agrrias e Veterinrias, Universidade Estadual Paulista UNESP Received February 3, 2009 Accepted April 7, 2009 Abstract The immature stages of Neotropical ticks are poorly known and in many cases have not been described. This work presents a morphological description of Amblyomma brasiliense larvae (F1) and a redescription of nymphs (F1). A. brasiliense is reported as one of the most aggressive ticks to humans in Brazil. Immature ticks obtained from a laboratory colony initiated from adult specimens collected in the Parque Estadual Intervales (24 18 S and 48 24 W), So Paulo, Brazil, were analyzed under scanning electron microscope, and also under light and stereoscopic microscopes. A. brasiliense larvae present basis capituli rectangular; short palpi; rounded idiosoma; coxa I with two spurs, the external one being longer than the internal one; and coxae II and III each with one short spur. Nymphs present basis capituli rectangular with a sharp pointed cornua; oval idiosoma with scutum reaching coxa III; coxa I with two evident spurs, the external one being longer than the internal one; coxae II-III each with one short spur; and coxa IV with a very short spur and chitinous tubercles on internal surface of posterior border of idiosoma. These morphological features, in association with chaetotaxy and porotaxy, should make possible the identification of immature Amblyomma ticks. Keywords: Amblyomma brasiliense , morphology, description, larva, nymph. Resumo Os estgios imaturos dos carrapatos Neotropicais so pouco conhecidos e, em muitos casos, no esto descritos. Este trabalho apresenta uma descrio morfolgica das larvas (F1) e redescrio das ninfas (F1) do carrapato Amblyomma brasiliense , relatado como um dos ixoddeos mais agressivos ao homem no Brasil. Para este fim, carrapatos imaturos de uma colnia iniciada com espcimes adultos do Parque Estadual de Intervales, So Paulo, Brasil foram analisados sob microscopia eletrnica de varredura, microscopia de luz e lupa estereoscpica. Observou-se que larvas tm a base do captulo retangular, palpos curtos e idiossoma arredondado, coxa I com dois espinhos, sendo o externo mais longo que...
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Amblyomma - www.cbpv.com.br/rbpv Rev. Bras. Parasitol....

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