How to Identify Dubois's Sea Snake (Identification Guide)
Dubois's Sea Snake is identified by its olive to grayish body with faint darker banding, a small head, and a fully marine paddle-tailed body form.
Read the full Dubois's Sea Snake encyclopedia entry →Key identifying features
Dubois's Sea Snake (Aipysurus duboisii) is a moderately slender, fully aquatic sea snake with a relatively uniform olive, gray, or brownish coloration and a small head only slightly wider than the neck. Like other true sea snakes, it has a flattened, paddle-shaped tail used for swimming.
Coloration & pattern
The body coloration is typically olive-gray to brownish, often appearing fairly uniform with only faint, indistinct darker banding or mottling that can be difficult to see at a distance. This subdued pattern differs from the boldly banded look of some other sea snakes, giving Dubois's Sea Snake a more understated appearance.
Head, eyes & scales
The head is small and rounded, not much wider than the neck, typical of Aipysurus sea snakes. Eyes are small with round pupils. Scales are smooth and closely fitted, well suited to a fully aquatic lifestyle, lacking the rough keeled texture of terrestrial vipers.
Size & body shape
Adults typically reach 60 to 80 cm, with a moderately slender, cylindrical body that flattens toward the tail into a paddle shape. Its size and build are similar to several other reef-associated sea snakes, making pattern and coloration important identification clues.
Range & habitat where you'll see it
This species inhabits coral reef environments in the tropical Indo-Pacific, particularly around northern Australia and nearby regions. It is fully marine, remaining in the water throughout its life and often found resting on or near coral substrate or foraging over the reef floor.
How to tell it apart from look-alikes
Dubois's Sea Snake can be difficult to distinguish from other olive or gray-toned reef sea snakes due to its relatively plain coloration and lack of bold contrasting bands. Careful attention to the faintness of any banding, overall body proportions, and known geographic range helps separate it from more boldly patterned species such as banded sea kraits or brightly ringed Hydrophis species. Its fully aquatic paddle-tailed body and small head are consistent with other true sea snakes rather than land-associated species.
Frequently asked questions
What color is Dubois's Sea Snake?
Typically olive-gray to brownish, often appearing fairly uniform with only faint, indistinct darker banding.
Is Dubois's Sea Snake boldly patterned like some other sea snakes?
No, its pattern is subdued and can look almost plain compared to boldly banded species.
How large does this species grow?
Adults typically measure 60 to 80 cm in length.
Where is it found?
On coral reefs in the tropical Indo-Pacific, particularly around northern Australia.
Does it ever leave the water?
No, it is fully marine and remains in water throughout its life.