Head black dorsally and ventrally, with a yellowish bar on the prefrontals, and with a yellowish streak behind the eye on the postocular and upper portion of last upper labial. Anterior part of body black dorsally and ventrally, with yellow crossbars on the dorsum. Posterior part of body olive dorsally and yellow ventrally, with black rings, which are broader on the dorsum.
The type specimen, a female, is 107 cm (42 in) in total length, with a tail 8.5 cm (3 1⁄4 in) long.
All dorsal scales rhomboidal and imbricate (overlapping). Dorsal scales on neck smooth, arranged in 25 rows. Dorsal scales on body with a short keel or small tubercle, in 35 rows. Ventrals 329.
Head very small. Body long, very slender anteriorly. Rostral slightly broader than deep. Frontal nearly twice as long as broad, as long as its distance from the rostral, slightly shorter than the parietals. One preocular and one postocular. A single anterior temporal. Seven or eight upper labials, second largest and in contact with the prefrontal, third and fourth (or third, fourth, and fifth) entering the eye. Two pairs of small chin shields, in contact with each other. Tail laterally flattened, oar-like.
- The Reptile Database. www.reptile-database.org.
- "Hydrophis". Integrated Taxonomic Information System. Retrieved 7 September 2007.
- Boulenger, G.A. 1896. Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the Colubridæ (Opisthoglyphæ and Heteroglyphæ),... Trustees of the British Museum (Natural History). London. xiv + 727 pp., Plates I.-XXV. (Hydrophis melanocephalus, p. 283 & Plate XV.)
- Gray, J.E. 1849. Catalogue of the Specimens of Snakes in the Collection of the British Museum. Trustees of the British Museum. London. xv + 125 pp. (Hydrophis sublævis Var. melanocephala, p. 53.)
- Kharin, V.E. 1984. A review of sea snakes of the group Hydrophis sensu lato (Serpentes, Hydrophiidae). 3. The genus Leioselasma [in Russian]. Zoologicheskii Zhurnal 63 (10): 1535–1546.
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