Moraes-Da-Silva, Antonio, Renata Cecília Amaro, Pedro M. Sales Nunes, Miguel Trefaut Rodrigues, and Felipe Franco Curcio. 2021. “Long Known, Brand New, and Possibly Threatened: a New Species of Watersnake of the Genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins-Araguaia River Basin, Brazil”. Zootaxa 4903 (2). Auckland, New Zealand:217–241. https://doi.org/10.11646/zootaxa.4903.2.3.