In Brazil, the genus Thamnodynastes currently (September 2021) has 12 species:

Thamnodynastes almae (Franco and Ferreira, 2002): Endemic to Brazil. Found in CE, RN, PB, PE, AL, SE, and BA.

Thamnodynastes nattereri (Mikan, 1820): Found in Brazil and Uruguay. In Brazil: MS, PB, PE, BA, ES, MG, RJ, SP, PR, SC, and RS.

Thamnodynastes chaquensis (Bergna and Alvarez, 1993): Argentina, Bolivia, Brazil, and Paraguay. In Brazil: MT and MS.

Thamnodynastes hypoconia (Cope, 1860): Argentina, Brazil, Paraguay, and Uruguay. In Brazil: TO, MT, MS, GO, DF, MA, PI, PE, AL, BA, ES, MG, RJ, SP, PR, SC, and RS.

Thamnodynastes lanei (Bailey et al., 2005): Argentina, Bolivia, Brazil, and Paraguay. In Brazil: AP, RO, PA, MT, and MS.

Thamnodynastes longicaudus (Franco et al., 2003): Endemic to Brazil. Found in ES, RJ, and SP.

Thamnodynastes pallidus (Linnaeus, 1758): Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela. In Brazil: AP, AC, RO, AM, PA, TO, MA, PB, PE, AL, SE, and BA.

Thamnodynastes phoenix (Franco et al., 2017): Endemic to Brazil. Found in TO, GO, PI, CE, RN, PB, PE, AL, SE, BA, and MG.

Thamnodynastes ramonriveroi (Manzanilla and Sánchez, 2005): Brazil, French Guiana, Guyana, Suriname, and Venezuela. In Brazil: RR.

Thamnodynastes rutilus (Prado, 1942): Endemic to Brazil. Found in MT, MS, DF, MG, RJ, and SP.

Thamnodynastes sertanejo (Bailey et al., 2005): Endemic to Brazil. Found in CE, PB, PE, BA, and MG.

Thamnodynastes strigatus (Günther, 1858): Argentina, Brazil, Paraguay, and Uruguay. In Brazil: MT, GO, BA, ES, MG, RJ, SP, PR, SC, and RS.

Identifying the species solely from photographs is very difficult, usually only well done by people who work with the genus or have much contact with these snakes.

For example, the differences between T. nattereri and T. hypoconia are very subtle. The belly of T. hypoconia has dark longitudinal lines, the dorsal scales are "keeled," and in the southeastern part of Brazil, it is found in the semi-deciduous slope of the Atlantic Forest and Cerrado. In contrast, T. nattereri has a belly without lines or very subtle ones, and it is found in the humid slope of the Atlantic Forest.

Author of this compilation: Glauco Oliveira - 24/09/2021.