First record of Thamnodynastes almae Franco & Ferreira, 2002 (Serpentes, Dipsadidae, Xenodontinae) in the state of Piauí, northeastern Brazil, and updated distribution map

We report for the first time the snake Thamnodynastes almae Franco & Ferreira, 2002 in Piauí, northeastern Brazil. Our record is based on two specimens and comprises the 17th known locality for the species. The new record represents the northernmost and westernmost locality, at the limit between the Caatinga and the Maranhão Babaçu Forest ecoregions, and extends this species’ geographic distribution 495 km from Milagres, state of Ceará. Updated distribution maps and images of preserved specimens are provided.