
The Hydrophiinae, also known as coral reef snakes or sea snakes, are a subfamily of venomous elapid snakes that inhabit marine environments for most or all of their lives. Though they evolved from terrestrial ancestors, most are extensively adapted to a fully aquatic life and are unable to move on land, except for the genus Laticauda, which retain...
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http://en.wikipedia.org/wiki/Hydrophiinae

Hydrophiidae is a sub-family of ovoviviparous reptiles of the Sea Snake family (Hydrophiidae) containing fifteen genera and some fifty-one species found mainly in coastal areas and estuaries. Members have their nostrils set high back on the snout.
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http://www.probertencyclopaedia.com/browse/BH.HTM
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