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  • Larvae and nymphs of Amblyomma tigrinum Koch,1844 and Amblyomma triste Koch, 1844 (Acari: Ixodidae) naturally parasitizing Sigmodontinae rodents

    Nava, S.; Lareschi, M.; Abba, A.M.; Beldomenico, P.M.; Venzal, J.M.; Mangold, A.J. and Guglielmone, A.A.

    2006 - Volume: 46 Issue: 3-4 pages: 135-141

    Date accepted: 2006-01, Date published: 2007-07-20

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    Larvae and nymphs of Amblyomma tigrinum Koch, 1844 and Amblyomma triste Koch, 1844 were collected on Sigmodontinae rodents in Argentina. Amblyomma tigrinum was found in the phytogegraphical provinces of Chaco and Monte from the Chaco domain, while A. triste was determined in the Paranaense province of the Amazonic domain and in the Pampean province of the Chaco domain. Larvae and nymphs of A. tigrinum were found on Akodon dolores (Thomas, 1916); Akodon molinae Contreras, 1968; Akodon oenos Braun, Mares and Ojeda, 2000; Calomys musculinus (Thomas, 1913); Graomys Thomas, 1916 sp.; only larvae were found on Calomys venustus (Thomas, 1894) and Phyllotis xanthopygus (Waterhouse, 1937). Larvae and nymphs of A. triste were found on Akodon azarae (Fischer, 1829); Calomys callosus Renger, 1830; Oxymycterus rufus (Fischer, 1814) and only nymphs on Oligoryzomys delticola (Thomas, 1917). All these Sigmodontinae are new hosts for these tick species. Birds are considered crucial for the life cycle of A. tigrinum; however the results of this study show that Sigmodontinae rodents may also play a role for the maintenance of this tick in nature. This information also confirms the importance of Sigmodontinae as natural host for A. triste. Although on a wide basis the distribution of both tick species appears to be sympatric they colonize different ecological niches.

    Photos: Varroa destructor (Varroidae) on a honey bee. Low temperature -Scanning electron microscopy photograph. Material collected and fixed for LT-SEM: J. Pettis, USDA-ARS-Bee Lab. and R. Ochoa, USDA-ARS-SEL; LT-SEM photo: E. Erbe and C. Pooley, USDA-ARS-CEMU © USDA; Petrobia harti (Tetranychidae) © INRA - Alain Migeon; Dermanyssus gallinae (Dermanysssidae) © Ecole Nationale Vétérinaire de Lyon – Lise Roy; Adult Ixodes sp. (Ixodidae) engorging on an Atlantic puffin Fratercula arctica © Andy Darrington; Panonychus ulmi (Tetranychidae): hatching of a winter egg © Université de Lausanne – Centre de microscopie électronique – Cazelles

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