Moraes-Da-Silva, A., Amaro, R.C., Nunes, P.M.S., Rodrigues, M.T. & Curcio, F.F. (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), 217–241.