Pseudoeryx plicatilis, the South American pond snake, is a species of snake of the family Colubridae. They can reach lengths averaging to 1.27 m (4.2 ft). The body of the snake is flattened more dorsally and has smooth scales. The head is compact and the snake is composed of primarily pale dorsal yellow lines with the scales being mostly olive brown. For adults the ventral side of the snake is yellow with rows of black dots. The juveniles have ventral sides that are bright orange or red with black doted rows.

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