Atractus stygius Passos, Azevedo, Nogueira, Fernandes & Sawaya, 2019

(Fig. 26)

Holotype. Adult male, MNRJ 26734 (formerly UFMT 8139), collected by Universidade Federal de Mato Grosso team in 2009 at Bocaiúva (12°29'50"S, 57°52'30"W [informed]; 312 m asl [informed]), Craveri River, Municipality of Brasnorte, State of Mato Grosso, Brazil.

Paratypes. MNRJ 26735 (formerly UFMT 9024), MNRJ 28144 (formerly UFMT 8138), MNRJ 28145 (formerly UFMT 9116), MZUSP 20667, UFMT 3949, UFMT 8137, UFMT 8140–8142 .

Remarks. Holotype (295 mm SVL) and paratype UFMT 8138 with prepared hemipenes. Holotype hemipenis kept inside cryotube together with specimen. No tissue samples available.