This is perhaps the longest species of seasnake, up to 2.75 metres (9.0 ft).
The scales on thickest part of body have rounded or pointed tips, and are imbricate. Six or seven maxillary teeth are found behind the fangs. The species has 25-31 scale rows around its neck, 33-38 around its midbody, and ventrals number 295-362, and are distinct throughout and about twice as broad as adjacent body scales. Its color is yellowish or yellowish-green above; the dorsal scales are edged with black, and 41-46 narrow black bands encircle the body; the bands are usually less than one-third the width of the lighter interspaces. The head, in the young, is black, with a yellow horseshoe-shaped marking; in the adult, the head is usually yellow. Total length in males is about1.62 metres (5.3 ft), and females 1.830 metres (6.00 ft); tail lengths are 140 millimetres (5.5 in) and 120 millimetres (4.7 in) in males and females, respectively.
H. spiralis is found in the Indian Ocean (Persian Gulf off Bangladesh, Oman, United Arab Emirates, Iran, Pakistan, Sri Lanka, India, Indonesia, Malaysia, Philippines, China, New Guinea), and New Caledonia/Loyalty Islands.
- "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 Proteroglyphæ),... Trustees of the British Museum (Natural History). London. pp. 273-274.
- The Reptile Database. www.reptile-database.org.
- Frith, C.B. 1977. The sea snake Hydrophis spiralis (Shaw); a new species of the fauna of Thailand. Nat. Hist. Bull. Siam Soc. (Bangkok) 26: 339-341.
- Shaw, G. 1802. General Zoology or Systematic Natural History, Vol. III., Part II. Amphibia. G. Kearsley (Thomas Davison, printer). London. vi + 313-365. (Hydrus spiralis, p. 564.)
- The IUCN Red List of Threatened Species(http://www.iucnredlist.org/details/176717/0).
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