Natrix

For the drug with trade name Natrix, see Indapamide.

Natrix is a genus of Old World snakes found mainly across Eurasia (although the range of Natrix tessellata extends into Egypt and those of N. astreptophora and N. maura into north-west Africa) in the subfamily Natricinae of the family Colubridae. They are commonly called grass snakes and water snakes, but some other snake species also known commonly as "grass snakes" and "water snakes" are not in the genus.

Natrix
Natrix natrix
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Serpentes
Family:	Colubridae
Subfamily:	Natricinae
Genus:	Natrix Laurenti, 1768
Type species
Natrix natrix

Species

The genus Natrix contains five extant species^[1] and at least five extinct (fossil-only) species.

Image	Scientific name	Common name	Distribution
	Natrix astreptophora (Seoane, 1885)	Iberian grass snake[2]	Iberian peninsula (Spain and Portugal), southern France, coastal north-west Africa (Morocco, Algeria, Libya, Tunisia)
	Natrix helvetica (Lacépède, 1789)	barred grass snake[3]	Western Europe, including southern Great Britain
	Natrix maura (Linnaeus, 1758)	viperine water snake [4]	Portugal, Spain, France, north-west Italy and into Switzerland; north-west Africa (Morocco, Algeria, Libya, Tunisia)
	Natrix natrix (Linnaeus, 1758)	grass snake [4]	Mainland Europe from mid Scandinavia to southern Italy, to northern Middle East and Central Asia
	Natrix tessellata (Laurenti, 1768)	dice snake [4]	Much of Eurasia, and Egypt
	†Natrix longivertebrata (Szyndlar, 1984)	extinct species (Pliocene, Miocene)	Poland, Austria, France[5]
	†Natrix merkurensis Ivanov, 2002	extinct species (Miocene)[6]	Czech Republic, France[7]
	†Natrix mlynarskii Rage, 1988	extinct species (Eocene–Miocene)	France[8]
	†Natrix parva Szyndlar, 1984	extinct species (Miocene)	Poland[9]
	†Natrix sansaniensis (Lartet, 1851)	extinct species (Miocene)[6]	Czech Republic, France

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Natrix.

Etymology

Natrix is classical Latin for a water snake. The word comes from a Proto-Indo-European root meaning "snake", with cognates in the Celtic and Germanic languages, the latter including the English adder. It was probably influenced through folk etymology by the Latin nare and natare meaning "swim";^[10][11] it appears to be a grammatically feminine word for "swimmer".

Geography

The refuge of a widely distributed Western European lineage regarding the barred grass snake commonly known as Natrix helvetica was most likely located in southern France and outside the classical refuges in the southern European peninsulas. One genetic lineage of the common grass snake (N. natrix) is also distributed in Scandinavia, Central Europe, and the Balkan Peninsula.^[12]