“…The collection studied includes reptiles from five municipalities in the Middle Gurguéia region (MG), southwestern Piauí: Alvorada do Gurguéia (AG) 08°27'03.6"S, 43°52'05.05"W; Cristino Castro (CC) 08°47'36.0"S, 44°12'26.2"W; Palmeira do Piauí (PP) 08°43'32.7"S, 44°14'04.5"W; Redenção do Gurguéia (RG) 09°28'24.8"S, 44°36'2.30"W, and Bom Jesus (BJ) 09°05'18.6"S, 44°19'41.4"W. Figure 1 shows these areas in the Gurguéia River Basin and eight other areas previously inventoried in the Parnaíba River Basin, used here for comparison: the municipalities of Batalha (BT; Silva et al, 2015), Barras (BR; Benício et al, 2015b), Castelo do Piauí (CP; Rodrigues & Prudente, 2011), Picos (PC; Benício et al, 2015a), and the conservation units Parque Nacional Sete Cidades (7C; Rocha & Prudente, 2010), Parque Nacional Serra da Capivara (CA; Cavalcante et al, 2014), Estação Ecológica de Uruçuí-Una (UU; Dal Vechio et al, 2013), and Parque Nacional Serra das Confusões (CO;Dal Vechio et al, 2016). Notes on the geographic distribution of reptiles of the Parnaíba River Basin are provided in the discussion.…”