Common names: transdanubian sand viper.[1]
Vipera ammodytes montandoni is a venomous viper subspecies endemic to Bulgaria and southern Romania.[2]
The subspecific name, montandoni, is in honor of "M. A. Montandon" who sent some of the first specimens of this snake to Boulenger.
According to Boulenger (1913): "Naso-rostral shield never reaching the canthus rostralis nor the summit of the rostral shield, which is deeper than broad (once and one seventh to once and a half); rostral appendage clad with 10-14 scales, in three (rarely two or four) transverse series between the rostral shield and the apex. Dorsal scales in 21 rows [at midbody]. Ventral shields 149 to 158; subcaudals 30 to 38. A more or less distinct blotch on the lower lip, involving five to seven labial shields without complete interruption. Lower surface of end of tail yellow."[3]
Bulgaria and southern Romania.[2]