| Summary: | This article describes a new species of Brazilian Raillietiella Sambon, 1910 from lungs of Tropidurus hispidus (Spix, 1825). Between July and October 2005 eighteen specimens of T. hispidus were actively captured with elastic rubber slings in granite outcrops (lajeiros) (06° 59’ S and 39° 31’ W) from caatinga formations in the municipality of Farias Brito, State of Ceará, Northeastern Brazil. One female and one male of T. hispidus had lungs infected by Raillietiella mottae sp. nov. (prevalence 11.1% and mean intensity of infection 6.0 ± 1.4, range 5-7). The parasite’s main diagnostic characteristics include the dimensions of sharp hooks and strongly curved or "C-shaped" male copulatory spicules with knob-like posterior projection from the base towards the inner curvature of the spicule.
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