How to Identify the Brown-Lipped Sea Krait (Identification Guide)
The Brown-Lipped Sea Krait is a banded amphibious sea snake identified by its blue-gray body, black rings, and brownish upper lip scales.
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Key identifying features
The Brown-Lipped Sea Krait (Laticauda laticaudata) is an amphibious sea krait recognized by its strongly banded body and the brownish coloration along its upper lip, which gives the species its name and helps separate it from similar kraits with yellow-toned lips.
Coloration & pattern
The body shows a pale blue-gray to grayish-blue background crossed by numerous narrow to moderately wide black bands that encircle the body from neck to tail. The bands are generally more numerous and somewhat narrower than in some related species, creating a tightly ringed pattern. The head is dark on top with the diagnostic brown tone along the lip scales, rather than the bright yellow seen in some relatives.
Head, eyes & scales
The head is small and only slightly wider than the neck, covered in large symmetrical head shields typical of kraits. Eyes are small with round pupils. Scales are smooth, and the belly retains broadened ventral scutes, an adaptation for crawling on land that distinguishes all sea kraits from true sea snakes.
Size & body shape
Adults generally range from 90 to 140 cm in length. The body is moderately slender and rounded in cross-section for most of its length, only flattening into a paddle shape at the tail, reflecting its dual marine and terrestrial habits.
Range & habitat where you'll see it
This species has a wide distribution across the Indo-Pacific, from the Bay of Bengal through Southeast Asia to parts of Melanesia and Polynesia. It is found around coral reefs, rocky coastlines, and small islands, often coming ashore on beaches and rock crevices to rest, digest, and lay eggs.
How to tell it apart from look-alikes
The brownish lip coloring, as opposed to the yellow lip and snout markings of the Erabu Sea Krait, is the clearest distinguishing feature between these two similar species. Band width and spacing can also help: the Brown-Lipped Sea Krait often shows a somewhat more uniform, narrower banding pattern. Checking for enlarged ventral scales confirms it as a sea krait rather than a fully marine sea snake.
Frequently asked questions
What does the name Brown-Lipped Sea Krait refer to?
It refers to the brownish coloration along the snake's upper lip scales, which contrasts with the yellow lip markings seen in some related sea kraits.
How can you tell this species apart from the Erabu Sea Krait?
The Brown-Lipped Sea Krait shows brown rather than yellow lip coloring and tends to have narrower, more closely spaced body bands.
Is the Brown-Lipped Sea Krait fully aquatic?
No, it is amphibious and regularly comes ashore on beaches and rocks to rest and lay eggs, unlike fully marine sea snakes.
What size does this krait reach?
Adults typically measure 90 to 140 cm in total length.