Amblyomma tigrinum (Acari : Ixodidae) in relation to phytogeography of central-northern Argentina with notes on hosts and seasonal distribution

The findings of Amblyomma tigrinum in continental Argentina north of 40 deg reesS are presented according to phytogeographic domains (Andean-Patagonic, Amazonian and Chaco) and the seasonal distribution is depicted on a monthl y basis. A total of 718 adult ticks and four nymphs were found. A. tigrinum ticks were present in all domains. Adult ticks were found all year round b ut they were more abundant during the summer. Most ticks were found on dome stic dogs but the survey has a bias to domestic hosts. It is speculated tha t the cycle of immature is bound to shelters that mitigate extreme climatic conditions, thus explaining the finding of this tick species in contrastin g ecological areas.