Nerodia

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Diamondback Water Snake, Nerodia rhombifer
Diamondback Water Snake, Nerodia rhombifer
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Natricinae
Genus: Nerodia
Baird & Girard, 1853

Nerodia is a genus of non-venomous colubrid snakes commonly referred to as water snakes.

Contents

[edit] Description

Nerodia species vary greatly, but all are relatively heavy-bodied snakes, sometimes growing to 4 feet or larger. They have flattened heads, with small eyes that have round pupils, and keeled scales. Species like N. fasciata display distinct banding, where other species, like N. erythrogaster have blotching, and N. rhombifer have diamond shaped patterning. Most species are brown or olive green, or some combination therein with markings being brown, or black. Yellow or cream colored accenting is common.

[edit] Behaviour

Water snakes, as their name implies are largely aquatic. They spend the vast majority of their time in, or very near permanent sources of water. Often they can be found basking on tree branches which overhang slow moving streams or ponds. Their primary diet is fish and amphibians, and they are quite adept at catching both in their aquatic environment. They will also consume rodents.

While their initial instinct is to flee when disturbed, they do typically have a nasty disposition, and do not often hesitate to strike or bite if handled, and will often expel a foul smelling musk from their cloaca.

[edit] Reproduction

Diamondback water snake, Nerodia rhombifer giving birth
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Diamondback water snake, Nerodia rhombifer giving birth

Nerodia species are ovoviviparous, breeding in the spring and giving birth in the late summer or early fall. They are capable of having clutches with as many as 90 or more young, but generally they are much smaller. Neonates are around 8–10" in length.

[edit] Species & subspecies

Blotched water snake, Nerodia erythrogaster transversa
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Blotched water snake, Nerodia erythrogaster transversa

[edit] Distribution

Nerodia species are widely spread around the southern and eastern half of the United States, north into Canada and south into Mexico, as well as to the island of Cuba. Many ranges overlap, and intergrading of subspecies is not unknown, but is rare.

[edit] In captivity

Due to how widespread and extremely common they are in the wild, water snakes are often found in the exotic pet trade, throughout the United States, though they are rarely captive bred. Their relative physical unattractiveness compared to other available pet snake species, and their poor disposition makes them less than attractive pets. They are easy to care for though, and do quite well in captivity.

[edit] Conservation concerns

Some species, such as N. harteri and N. paucimaculata are only found in very isolated localities and are protected by state laws, but the majority of Nerodia species hold no specific conservation status. Due to their habitat choice, poor disposition, and vague similarity to the venomous cottonmouth (Agkistrodon piscivorus), they are frequently mistaken for them. This results in many more water snakes being killed every year than cottonmouths. Often, water snakes found in areas where the cottonmouth does not range are still killed by humans out of ignorance and fear.

[edit] References

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