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en.wikipedia.org/wiki/Hydrophiinae

Sea snakes, or coral reef snakes, are a subfamily of venomous elapid snakes, the Hydrophiinae, that inhabit marine environments for most or all of their lives. Most are extensively adapted to a fully aquatic life and are unable to move on land, except for the genus Laticauda, which has limited land movement.They are found in warm coastal waters from the Indian Ocean to the Pacific and are ...

sites.google.com/site/venomousdangerous/snakes/most-venomous-sea-snakes

The Beaked Sea Snake measures 47 to 116 cm, it is a dirty white to a pale greenish gray with some 40-50 dark round blotches on its back. The Beaked Sea Snake is one of the most venomous snakes either on land or in the sea. Indeed, scientists have estimated its venom to be 4 to 8 times more lethal than that of a cobra.

www.quora.com/Are-all-sea-snakes-venomous

All Sea Snakes that belong to the subfamily Hydrophiinae, which includes all the ones colloquially known as “sea snakes” that I’m aware of, are elapids (cobra relatives) and have powerful venoms. To my knowledge, all species are potentially deadly to humans, though sea snake bites are quite rare.

www.reference.com/pets-animals/snakes-venomous-e07099d463e79034

Not all snakes are venomous, but even nonvenomous snakes are subject to strike if they feel frightened or sense danger. In North America, an easy way to determine if a snake is poisonous is to look at its pupils.

www.thoughtco.com/venomous-sea-snakes-4160683

The true sea snakes are most closely related to Australian cobras, while kraits are related to Asian cobras. Like their terrestrial relatives, sea snakes are highly venomous. Unlike terrestrial cobras, most sea snakes are not aggressive (with exceptions), have small fangs, and avoid delivering venom when they bite.

www.britannica.com/animal/sea-snake

Sea snake, any of more than 60 species of highly venomous marine snakes of the cobra family ().There are two independently evolved groups: the true sea snakes (subfamily Hydrophiinae), which are related to Australian terrestrial elapids, and the sea kraits (subfamily Laticaudinae), which are related to the Asian cobras. Although their venom is the most potent of all snakes, human fatalities ...

en.wikipedia.org/wiki/List_of_dangerous_snakes

Of the 3,400 snake species, there are around 600 venomous snake species in the world. This is an overview of the snakes that pose a significant health risk to humans, through snakebites or other physical trauma.. The varieties of snake that most often cause serious snakebites depend on the region of the world.

www.kidzone.ws/lw/snakes/facts-seasnake.htm

The average Sea snake grows to about 2 meters long and has a smallish head for its body size. Their tails are flattened to make fast swimming possible and flaps over their nostrils close when they are underwater. Sea snakes are very poisonous. The most poisonous one is the Beaked Sea Snake. Just 3 drops of venom can kill about 8 people!

www.fieldandstream.com/10-most-venomous-snakes-in-world

*Field & Stream* ranks the 10 most venomous snakes in the world. Snakes are highly effective predators, and some species that rely on venom for hunting and self-defense can deliver a bite toxic ...

www.conservationinstitute.org/10-most-poisonous-dangerous-snakes-in-the-world

Some snakes are dangerous because of the speed or ferocity of their attacks, others because of how common and widespread they are, and still others because their toxins are so deadly. Here is a list of the most dangerous snakes in the world