title: [Notes on reptiles of Tunesia. VII. Observations on a double-headed snake Natrix (Reptilia: Colubridae)].
abstract: A case of a double-headed Viperine Snake Natrix maura (Linné, 1758) hatching is reported. Its two heads are side by side, about equally and perfectly developed and the neck is dual for the 8 first vertebras. Two post-pharyngeal fistulas and dissymetries in the cephalic markings and scales are noted. The origin of such an anterior dichtomy is discussed.
mesh_terms: D000818:Animals; D006257:Head / Q000002:abnormalities*; D012911:Snakes / Q000033:anatomy & histology; D014416:Tunisia
vernacular_title: Notes sur les reptiles de Tunisie. VII. Observations sur un serpent bicéphale du g. Natrix (Reptilia: Colubridae).