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Cnidaria

These have stinging cells and include jellyfish, anemones and corals.

Dahlia anemone, photograph by Tim Allsop

Cnidaria are some of the prettiest animals in our waters, usually with soft fleshy bodies and long feeding tentacles. They dominate some of our reef walls; vivid jewel anemones and fluffy looking plumose anemones cloak the rock in places – a riot of colour in their underwater landscape.

Anemones
Anemones
Looking like beautiful flowers but their stinging cells make them deadly predators. They can be found attached to rocks and hard surfaces.
 
Coral
Corals
They can be colonial or solitary and have a skeleton structure that supports their bodies
 
Portuguese man of war
Hydroids
These form colonies linked together where individuals may serve different purposes. Like all cnidaria they have stinging cells
 
Jellyfish
Jellyfish
Their body usually forms a bell with tenticles that are armed with stinging cells to catch their prey