5. Black banded seakrait, blue-lipped sea krait, large scaled sea krait (Laticauda laticaudata)
LD50: 0.16
More common in waters of Pacific Ocean, this highly venomous aquatic snake can be found on northastern Indian coasts. It is slender and relatively short (around 27 inches) snake vividly colored in black and blue grayish bands. It rarely encounters humans, because it is not defensible and will attack only if highly necessary.
