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Hypsiglena torquata, the night snake, is a species of rear-fanged colubrid.It is found from Mexico, through much of the eastern United States and south central British Columbia, Canada [3] [4] It is characterized by dark brown systematic blotches down its back and sides, a bar behind each eye, vertical pupils, and neck adornment.
Demansia torquata is the only species of its genus with a collared nape within its geographical distribution. D. rimicola is the closest species, geographically. It can be distinguished from D. torquata as the latter has a pale upper edge of the ‘teardrop’ marking extending across the face and adjoining with the anterior band of the nape collar.
Hypsiglena torquata (Günther, 1860) – night snake Hypsiglena unaocularus W. Tanner, 1946 – Islas Revillagigedo night snake Nota bene : A binomial authority or trinomial authority in parentheses indicates that the species or subspecies was originally described in a genus other than Hypsiglena .
Night snake may refer to: Siphlophis, a snake genus, the spotted night snakes; Hypsiglena, a snake genus; Hypsiglena torquata, a species within this genus; Philodryas agassizii, the burrowing night snake
Hypsiglena jani, commonly known as the Texas night snake or the Chihuahuan night snake, is a small species of mildly venomous snake in the subfamily Dipsadinae of the family Colubridae. The species is native to the southwestern United States and adjacent northeastern Mexico .
Hypsiglena torquata unaocularus Hypsiglena unaocularus , commonly known as the Islas Revillagigedo night snake or Clarión night snake , is a species of small colubrid snake endemic to Clarion Island , initially described from a single specimen collected by William Beebe in 1936.
The California night snake grows to a total length of 12 to 26 inches (30 to 66 cm), with hatchlings about 7 inches in total length. [3] The snake has a narrow flat head, smooth dorsal scales in 19 rows, and eyes with vertically elliptical pupils. [3] They are rear-fanged and considered to be venomous, but not dangerous to humans. [3]
Demansia rufescens Storr, 1978 – rufous whip snake; Demansia shinei Shea, 2007 – Shine's whipsnake; Demansia simplex Storr, 1978 – grey whipsnake; Demansia torquata (Günther, 1862) – collared whipsnake; Demansia vestigiata (De Vis, 1884) – lesser black whipsnake