How to Identify the Annulated Sea Snake (Identification Guide)

Key identifying features

The annulated sea snake shows a series of bold, complete dark rings or bands encircling the entire body at regular intervals, contrasting sharply against a pale gray, cream, or yellowish background. This strongly ringed pattern, combined with a laterally flattened, paddle-shaped tail, makes the species one of the more recognizable banded sea snakes.

Coloration & pattern

The base color is typically pale gray, cream, or pale yellow, crossed by dark gray, brown, or black rings that fully encircle the body rather than forming partial blotches, giving a clean, evenly spaced banded appearance from head to tail. The bands are usually consistent in width and spacing along most of the body length.

Head, eyes & scales

The head is small and blends into the neck, with nostrils positioned on top of the snout for surface breathing. Scales are small and smooth, and the head is sometimes uniformly dark or only lightly marked compared to the strongly banded body.

Size & body shape

Adults typically reach 2.5 to 3.5 feet in length, with a body that is moderately slender through the front half and increasingly compressed toward the tail, which flattens into a broad paddle shape for swimming.

Range & habitat where you'll see it

Annulated sea snakes are found in coastal and shelf waters of the Indo-Pacific, often over sandy or muddy bottoms near river mouths and estuaries, where they hunt fish and eels among the substrate.

How to tell it apart from look-alikes

The fully encircling, evenly spaced dark rings distinguish this species from sea snakes with irregular blotches or fading bands, and from banded sea kraits, which typically have a more clearly demarcated head color and spend more time on land. Its paddle-shaped tail and scaled body separate it readily from banded eels, which lack scales and a paddle tail entirely.