title: Life cycle of Ornithodoros rostratus (Acari: Argasidae) under experimental conditions and comments on the host-parasite relationship in the Pantanal wetland region, Brazil.
abstract: The genus Ornithodoros is represented by 15 species in Brazil, on which no detailed life cycle studies have been published, except for O. talaje and O. mimon. The aim of the present study was to evaluate life cycle parameters of O. rostratus based on ticks collected in the Pantanal wetland region of the state of Mato Grosso do Sul, Brazil, using domestic rabbits as experimental hosts. The periods of pre-attachment and feeding of the larvae lasted an average of 39 min (range 15-76 min). Five or six nymphal instars were found. The emergence of adults started with N3 in the following sequence: N3-two males; N4-13 males; N5-three males and 16 females; and N6-two females. Mean weight of N4 that molted to males was 31.7 ± 13.6 mg, whereas mean weight of N5 that molted to females was 100.1 ± 36.2 mg. The overall sex ratio was 1:1. Oviposition lasted 14 days, with a sharp decline beginning with the 7th day. The overall duration of the life cycle of O. rostratus ranged from approximately 66 to 136 days. Comments on the tick-host relationship in the Pantanal region are offered.
authors: Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ 23890-000, Brazil.
authors: Carla Carolina Dias Uzedo
authors: CC
authors: Ribeiro
authors: João Luiz Horácio
authors: JL
authors: Faccini
authors: Paulo Henrique Duarte
authors: PH
authors: Cançado
authors: Eliane Mattos
authors: EM
authors: Piranda
authors: Darci Moraes
authors: DM
authors: Barros-Battesti
authors: Romário Cerqueira
authors: RC
authors: Leite
mesh_terms: D000818:Animals; D001938:Brazil; D004285:Dogs; D005247:Feeding Behavior; D005260:Female; D006790:Host-Parasite Interactions; D007814:Larva / Q000254:growth & development / Q000502:physiology; D008018:Life Cycle Stages; D008297:Male; D010058:Oviposition; D011817:Rabbits; D012098:Reproduction; D012744:Sex Ratio; D034421:Sus scrofa / Q000469:parasitology; D013987:Ticks / Q000254:growth & development / Q000502:physiology*; D053833:Wetlands