Erythrolamprus poecilogyrus is a species of snake in the family Colubridae.

The species is found in Argentina, Uruguay, Brazil, Venezuela, Bolivia, Guyana, Paraguay, and Peru.

The genus Erythrolamprus belongs to the subfamily Dipsadinae, which is sometimes referred to as the family Dipsadidae.

Recent phylogenetic analysis of morphological and molecular DNA evidence has shown that Erythrolamprus poecilogyrus is now likely paraphyletic.

[3] The relationships of Erythrolamprus species located in northern South America can be shown in the cladogram below:[3] Erythrolamprus poecilogyrus (paraphyletic) E. ceii Erythrolamprus poecilogyrus (paraphyletic) E. miliaris E. miliaris E. typhlus (Brazil) (paraphyletic) E. reginae (paraphyletic) E. reginae (paraphyletic) E. zweifeli E. breviceps E. epinephalus (Peru) (paraphyletic) E. epinephalus (Costa Rica) (paraphyletic) E. pseudoreginae E. melanotus E. atraventer E. jaegeri E. almadensis E. juliae E. cursor E. typhlus (French Guiana) (paraphyletic) E. cobella E. aesculapii (Brazil) (paraphyletic) E. ocellatus E. aesculapii (French Guiana & Guyana) (paraphyletic) E. bizona E. mimus