Cnidarian

Lion's Mane Jellyfish

Cyanea capillata

Common Hydra

Hydra vulgaris

Immortal Jellyfish

Turritopsis dohrnii

Upside-down Jellyfish

Cassiopea andromeda

Disc Anemone

Discosoma nummiforme

Irukandji

Carukia barnesi

Phosphorescent Sea Pen

Pennatula phosphorea

Water Jellyfish

Aequorea victoria

Barrel Jellyfish

Rhizostoma pulmo

Giant Anemone

Stichodactyla gigantea

Branching Fire Coral

Millepora alcicornis

Helmet Jelly

Periphylla periphylla

Beadlet Anemone

Actinia equina

Box Jelly

Chironex fleckeri

Head Coral

Favia favus

Organ Pipe Coral

Tubipora musica

Common Mushroom Coral

Fungia fungites

Mauve Stinger

Pelagia noctiluca

Portuguese Man-of-war

Physalia physalis

Red Coral

Corallium rubrum

Moon Jellyfish

Aurelia aurita

Ritteri Anemone

Heteractis magnifica

Sea Nettle

Chrysaora fuscescens

Hump Coral

Porites lobata