Diagnosis A species having a total length from 99 to 530 mm. The skin is smooth; primary annuli are incomplete at the dorsal and ventral midlines and their number shows lower varation (extremes 70-81 for adults); secondary annuli are absent. Head dorso-ventrally compressed; prominent snout projecting beyond the mouth; nostrils oval, directed dorsolaterally and clearly closer to the snow than the eyes. Tentacle in a white area that projects posteriorly to the eye and is in contact with it or not. The bead is wider posteriorly and the distance between the eyes is greater than that between the nostrils. Body width is greatest at the middle of the body, followed by the width at the neck and is smallest at the terminal tip.