Venom of a sea snake is highly potent. A fatal dose of venom from the Beaked sea snake, for an adult human, is only 1.5 mg. An average sized sea snake can produc 10-15 mg of venom.
Cassiopea sp. actually lives on the sea floor unlike other jellyfish. It lies on the sandy bottom and points its bushy arms directed upwards. They can easily be mistaken for an anemone.
