Dangerous Marine Life in Thailand

Nearly invisible cube-shaped bell with long trailing tentacles. Among the most venomous animals on Earth.

Camouflaged as a rock. 13 dorsal spines deliver venom when stepped on.

Striking red/white striped fish with feathery venomous spines.

Black spherical body with long sharp brittle spines that break off in skin.

Tiny jellyfish about the size of a fingernail. The sting itself is mild, but severe systemic 'Irukandji syndrome' follows 20–40 minutes later.

Blue-purple gas-filled float with tentacles up to 30m long. Not a true jellyfish but a colony organism.

Patterned cone-shaped shell (up to 15cm) that fires a venomous harpoon. There is no antivenom.

Small golf-ball-sized octopus that flashes iridescent blue rings when agitated. Carries tetrodotoxin.