Hydrophiini

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True or viviparous sea snakes, or coral reef snakes (tribe Hydrophiini), are a group of elapid snakes that inhabit marine environments for most or all of their lives. They comprise 62 species divided among 15 genera. Most sea snakes are venomous, except the genus Emydocephalus, which feeds almost exclusively on fish eggs. True sea snakes are extensively adapted to a fully aquatic life and are unable to move on land, unlike the sea kraits, which have limited land movement. They are found in warm coastal waters from the Indian Ocean to the Pacific and are closely related to venomous terrestrial snakes in Australia. All sea snakes have paddle-like tails and many have laterally compressed bodies that give them an eel-like appearance. Unlike fish, they do not have gills and must surface regularly to breathe. Along with cetaceans, they are among the most completely aquatic of all extant air-breathing vertebrates. Among this group are species with some of the most potent venoms of all snakes. Some have gentle dispositions and bite only when provoked, while others are much more aggressive.