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The dangerously venomous Hydrophis viperinus (sometimes referred to as Thalassophina viperina or Praescutata viperina; see Sanders et al. 2013) is found in coastal waters of Myanmar as well as in the Persian Gulf east to the Gulf of Siam (=Gulf of Thailand), southern China, and Borneo (Leviton et al. 2003 and references therein).
Leviton et al. (2003) peovide a technical description of this species: Scales hexagonal, juxtaposed, in 27-34 rows on the neck, 37-50 at midbody, ventrals 226-274, anteriorly about half the width of the body, narrowing posteriorly to about twice the width of the adjacent scales, or slightly less; head shields entire, nostrils superior, nasal shields in contact with one another; prefrontals longer than broad, not in contact with upper labials; 1, rarely 2, pre- and 1 to 2 postoculars; 7-9 upper labials, 3-5 bordering eye (sometimes only 3-4 or 4-5); usually 1 anterior temporal, occasionally2 or 3; body more or less bicolored, gray above , white below, the 2 usually clearly demarcated on the sides, often with 25-35 dark rhomboidal spots, rarely with dark bands. Total length: males 925 mm, females 820 mm; tail length: males 100 mm, females 80 mm.
As in all Hydrophiinae, there is no difference between dorsal and ventral scales, both of which are hexagonal in this species.
de Silva et al. (2011) reported preliminary observations on the sex, reproductive status, and reproduction of six species of hydrophiine sea snakes (including Hydrophis viperinus) collected as fishing bycatches in different coastal regions of Sri Lanka.
