Abstract
Many argasid tick species are known only through their larval descriptions, in which the chaetotaxy, together with other external morphological characteristics, has been used to separate genera and species. However, the illustrations of these features are based on optical microscopy alone and many of these features are not clearly defined. Because of the difficulties in determining the larval and nymph stages of some genera, we have prepared illustrated keys for the immature stages of argasids, including an up-to-date list of the known species of the Neotropical region. We have also included an illustrated key for larvae of the Ornithodoros species from Brazil, based on scanning electron microscopy.
Highlights
The argasid fauna comprises around 200 known species in the world (NAVA et al, 2009; GUGLIELMONE et al, 2010; DANTAS-TORRES et al, 2012; VENZAL et al, 2013a)
We have included an illustrated key for larvae of the Ornithodoros species from Brazil, based on scanning electron microscopy
There is no current record of Otobius in Brazil, but this genus is represented by two species around the world; in the Neotropics, only Otobius megnini (Dugès, 1883) has been recorded
Summary
The argasid fauna comprises around 200 known species in the world (NAVA et al, 2009; GUGLIELMONE et al, 2010; DANTAS-TORRES et al, 2012; VENZAL et al, 2013a). We present a current list of all argasid species in the Neotropical region, including a key to the genera of immature stages in this region and a key to larvae of Ornithodoros species in Brazil.
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