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Moraes-da-Silva, Cecília Amaro, Sales-Nunes, Rodrigues & 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, Vol. 4903 (2): p. 217-241. DOI : https://doi.org/10.11646/zootaxa.4903.2.3