The banded water snake or Southern water snake (Nerodia fasciata) is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of mostly aquatic, nonvenomous, colubrid

Colubrid

A colubrid is a member of the snake family Colubridae. This broad classification of snakes includes about two-thirds of all snake species on earth. The earliest species of the snake family date back to the Oligocene epoch. With 304 genera and 1,938 species, Colubridae is the largest snake family...

 snake

Snake

Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales...

 found in the central and southeastern United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

, from Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

, south to Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 and east to Florida

Florida

Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

.

Description

The Southern water snake grows from 24 inches (61 cm) to 48 inches (121.9 cm), and is typically gray, green-gray or brown in color with dark cross-banding. Many specimens are so dark in color their patterning is barely discernible. They have a flat head, and are fairly heavy bodied. Their appearance leads them to be frequently mistaken for other snakes with which they share a habitat, including the less common cottonmouth

Agkistrodon piscivorus

Agkistrodon piscivorus is a venomous snake, a species of pit viper, found in the southeastern United States. Adults are large and capable of delivering a painful and potentially fatal bite. When antagonized they will stand their ground by coiling their bodies and displaying their fangs...

.

Subspecies

There are three recognized subspecies of N. fasciata:

• Nerodia fasciata confluens (Blanchard
  Frank N. Blanchard
  Frank Nelson Blanchard was an American herpetologist, and professor of zoology at the University of Michigan. He is credited with identifying several new species, including the Broad-banded Water Snake, Nerodia fasciata confluens, and the Florida King Snake, Lampropeltis getula floridana...
  
  , 1923)
• Nerodia fasciata fasciata (Linnaeus
  Carolus Linnaeus
  Carl Linnaeus , also known after his ennoblement as , was a Swedish botanist, physician, and zoologist, who laid the foundations for the modern scheme of binomial nomenclature. He is known as the father of modern taxonomy, and is also considered one of the fathers of modern ecology...
  
  , 1766)
• Nerodia fasciata pictiventris
  Nerodia fasciata pictiventris
  The Florida banded water snake , a subspecies of the Southern water snake , is a nonvenomous natricine colubrid.-Geographic range:...
  
  (Cope
  Edward Drinker Cope
  Edward Drinker Cope was an American paleontologist and comparative anatomist, as well as a noted herpetologist and ichthyologist. Born to a wealthy Quaker family, Cope distinguished himself as a child prodigy interested in science; he published his first scientific paper at the age of nineteen...
  
  , 1895)

Taxonomy

Some sources consider Nerodia clarkii compressicauda and Nerodia clarkii taeniata to be subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

of Nerodia fasciata.

External links

• Southern Banded Water Snakes