Thamnodynastes cf. nattereri (Mikan, 1820)

Type locality. “Sebastianópolis,” currently Rio de Janeiro, state of Rio de Janeiro, Brazil, (U. Caramaschi, pers. comm. in Franco and Ferreira, 2002). Coluber nattereri was formerly in the synonymy of T. strigilis (Thunberg, 1787), a name adopted for many Thamnodynastes species with 19 keeled dorsal scale rows (Franco and Ferreira, 2002). The type specimen is lost, and ongoing taxonomic studies (V. Trevine, pers. comm.) will clarify the association of a name to this species, which is diagnosable from all known congeners with 19 dorsal scale rows by its weakly keeled dorsals and the immaculate ventral portion of head (Franco and Ferreira, 2002).

Distribution. Known from Brazil and Uruguay (Plt. 352A). In Brazil, widespread in the Atlantic Forest, with marginal records in Pampas Grasslands, Araucaria Forest, and Caatinga (Plt. 352A). Recorded from low to intermediate elevations (Plt. 352B). Observed in the field in forest (Marques and Sazima, 2004; Hartmann et al., 2009; Dorigo et al., 2014) and open areas (Guedes et al., 2014).