Introduction

Periphylla periphylla is found in every ocean of the world apart from the Arctic, at 1,000 to 7,000 metres deep.Light is toxic to this jellyfish and it only moves up to shallower depths at night.Like many jellyfish Periphylla periphylla has large stinging cells on its tentacles that it uses to attack prey.It is unusual because it can produce flashes of light by a chemical reaction called bioluminescence that helps protect it from predators.