Michael Pitts / Mastigias jellyfish {Mastigias sp.} Palau, Western Pacific Islands

Jose B. Ruiz / Sponge {Ircinia fasciculata} and Neptune grass {Posidonia} Mediterranean. Spain

Constantinos Petrinos / Stove Pipe sponge {Aplysina archeri} Bonaire, Caribbean

Doug Perrine / Orange ball corallimorph {Pseudocorynactis caribbeorum} Grand Cayman, Caribbean Sea (Non-ex).

Doug Perrine / Warty corallimorph oral disk {Rhodactis osculifera / Discosoma sanctithomae} Caribbean Sea NB shrimp with red (Non-ex).

SINCLAIR STAMMERS / Adult round worms {Toxocara canis} parasitic nematodes, Magnified X 5

Jeff Rotman / Close up of Brain coral {Diplora strigosa} Caribbean

Jeff Rotman / Mushroom coral {Fungia sp.} Palau Islands, Pacific Ocean

Juergen Freund / Tube coral (Dendrophyllia) Philippines, Pacific Ocean

Georgette Douwma / Featherstar on seafan, Sulawesi, Indonesia.

Francis Abbott / Purple stinger jellyfish (Pelagia noctiluca) Mediterranean

Juergen Freund / Mushroom coral {Fungia sp.} skeleton from the Philippines

Jeff Rotman / Prickly Alcyonarian coral {Dendronepthya sp} close-up, Red Sea

Juergen Freund / Split-level of Sponge underwater at low tide, Indo-Pacific

Michael Pitts / Mass of Mastigias jellyfish at surface Palau, Western Pacific Islands

Aflo / N-11405 Underwater coral reef landscape with tropical fish

Hans Christoph Kappel / Candy striped flatworm {Prostheceraeus vittatus} Europe

Jose B. Ruiz / Sponge {Ircinia spinosula} in Mediterranean. Spain

Jose B. Ruiz / Sponge {Leucosolenia variabilis} Mediterranean. Spain

Jose B. Ruiz / Sponge {Ircinia fasciculata} Mediterranean. Spain.

Jose B. Ruiz / Sponge {Clathrina coriacea} Mediterranean. Spain.

Jose B. Ruiz / Marine sponge {Dysidea fragilis} Mediterranean. Spain.

Alan James / Common / Moon jellyfish detail {Aurelia aurita} UK.

Dan Burton / Lion's mane jellyfish in sea {Cyanea capillata} UK.

Solvin Zankl / Comb jelly {Leucothea pulchra}

Doug Wechsler / Close up of Sea anemone oral disk {Tealia sp} Pacific coast, USA

GEORGETTE DOUWMA / Soft coral {Dronephthya genus} Andaman Sea, Thailand

Michael Pitts / Mass of Mastigias jellyfish at surface {Mastigias sp.} Palau, Western Pacific Islands

Francis Abbott / Leather coral with polyps exted {Sarcophyton trocheliophorum} Red Sea

Juergen Freund / Whip Coral (Ctenocella sp) Indo Pacific

Georgette Douwma / Organ pipe coral {Tubipora musica} Bunaken, Sulawesi, Indonesia

Niall Benvie / Common jellyfish washed ashore {Aurelia aurita} Scotland, June summer

Constantinos Petrinos / Sea anemone {Condylactis sp} Sulawesi, Indonesia

Jeff Rotman / Moon jellyfish {Aurelia aurita} at surface indicating plankton migration, Irish Sea, UK

Jeff Rotman / Lion's mane jellyfish (Cyanea capillata) USA, atlantic

Michael Pitts / Mastigias jellyfish at surface {Mastigias sp} Palau, Western Pacific Islands

TOM WALMSLEY / Flatworm and eggs {Platyhelminthes}

Francis Abbott / Cotylorhiza tuberculata - rare, large jellyfish thought not to sting; note large number of aural lobes. Mediterranean Sea

Francis Abbott / Cotylorhiza tuberculata - rare, large jellyfish thought not to sting; note large numbers of aural lobes. Mediterranean Sea

Constantinos Petrinos / Magnificent anemone {Heteractis magnifica} with Anemonefish {Amphiprion ocellaris} Sulawesi

Francis Abbott / False coral (Myriapora truncata) Menorca

GEORGETTE DOUWMA / Hydroid {Aglaophenis cupressina} Sulawesi, Indonesia its powerful sting is dreaded by

SINCLAIR STAMMERS / Filarial nematode worm {Toxascaris leonina}, parasitic on large mammals, Magn. X 128

SINCLAIR STAMMERS / Close-up of embryo of parasitic filarial nematode worm {Toxascaris leonina} Magn. X 64

SINCLAIR STAMMERS / Close-up of eggs of parasitic filarial nematode worm {Toxascaris leonina} Magn. X 128

Juergen Freund / Sea thimble jellyfish close up. (Linuche unguiculata) Caribbean approx 15mm in size. In Spring many millions found at water surface.

Juergen Freund / Sea thimble jellyfish (Linuche unguiculata) Caribbean. Surface waters; usually in swarms in spring, Caribbean Sea. Mildly toxic. Size c15mm

Juergen Freund / Sea thimble jellyfish, Caribbean. Inhabit surface waters and usually appear in swarms in spring in Caribbean Sea. Mildly toxic, contact with sensitive skin may produce a mild sting. Size approx 15mm

Juergen Freund / Sea thimble jellyfish close up (Linuche unguiculata) Caribbean Inhabits surface waters; usually appear in swarms in spring in Caribbean Sea. Mildly toxic, contact with sensitive skin may produce a mi...

Francis Abbott / Upside down jellyfish (Cassiopeia andromeda) Pacific, Yap, Palau.

Juergen Freund / Tube coral. Philippines, Pacific

Juergen Freund / Anemone hermit crab with anemone attached, Indo-Pacific Ocean.

Juergen Freund / Tube anemone, Mediterranean Sea

Juergen Freund / Coral reef scenic in the South Pacific off Phillippines.

Tim Edwards / Compass jellyfish stranded on beach {Chrysaora hysoscella} Derrynane bay, Kerry, Republic of Ireland.

Francis Abbott / Jellyfish (Cotylorhiza tuberculata) Mediterranean. A rare and large jellyfish that is thought not to sting.

Juergen Freund / Anemone crab on anemone. Pacific, Phillipines

SINCLAIR STAMMERS / Comb jelly (Beroe ovata), beating cilia make colour (plankton). France, Mediterranean

Juergen Freund / Californian club tipped anemone

Juergen Freund / Comb jelly swimming (Ctenophora).

Niall Benvie / Beadlet anemone (Actinia equina) with periwinkles. Mull, Scotland, UK, Europe

Juergen Freund / Comb Jelly (Ctenophore)

Alan James / Sea anemones {Sagartia elegans} Scilly Isles UK

GEORGETTE DOUWMA / Sea pen {Pteroeides sp} Sangalaki, Indonesia

GEORGETTE DOUWMA / Sea pen {Pteroeides sp} Sangalaki, Indonesia

Niall Benvie / Beadlet anemone with periwinkles (Actinia equina) Mull, Scotland

Constantinos Petrinos / Flatworm {Thysanozoon nigropapillosum} Sulawesi Indonesia

Francis Abbott / Coral {Pocillopora verrucosa} Red Sea, Middle East

Adrian Davies / Green hydra {Hydra viridissima}

Juergen Freund / Upside down jellyfish {Cassiopeia) Caribbean

Georgette Douwma / Coral {Stylophora pistillata} Great Barrier Reef, Australia

Francis Abbott / Finger coral {Porites lutea} Bahrain, Persian Gulf

Francis Abbott / Finger coral {Porites nodifera} Persian Gulf

Constantinos Petrinos / Mushroom coral {Fungia costulata} Sulawesi, Indonesia

Juergen Freund / Coral {Euphyllia ancora} Pacific, Philippines

Francis Abbott / Daisy coral tentacles extended {Goniopora columna} Red Sea,

Francis Abbott / Daisy coral, Yap Islands, Palau, Micronesia

GEORGETTE DOUWMA / Hard Acropora coral close up, Great Barrier Reef, Australia

Francis Abbott / Close up of Fire coral {Milleporidae family} Yap Island, Palau

Juergen Freund / Mushroom coral {Fungia fungites} Philippines, Pacific

Juergen Freund / Papua jellyfish {Mastigias papua} Sulu-sulawesi seas, Indo-Pacific ocean

David Shale / Deep-sea lobate Ctenophore, Gulf of Mexico

Jeff Rotman / Staghorn coral {Acropora sp} with polyps open at night. Palau, Micronesia, Pacific.

SINCLAIR STAMMERS / Comb jelly (Beroe ovata) NB Mouth on left. Plankton

Juergen Freund / Jellyfish (Rhizostoma pulmo) with symbiotic fish. Mediterranean Sea

Juergen Freund / Close-up detail of coral, Philippines

Juergen Freund / Sea anemone feeding {Tealia lofotensis} Canadian Pacific. Tentacles out. Sequence

Sue Daly / Compass jellyfish {Chrysaora hyoscella} Jersey, Channel Isles

Alan James / Dahlia anemone {Tealia felina} England

Juergen Freund / Tentacles of Magnificent anemone {Heteractis magnifica} Indo Pacific

Juergen Freund / Proliferating anemone {Epiactis prolifera} Underwater Pacific / Canada

David Hall / Star coral polyps feeding at night (Montastrea sp). Bonaire

David Hall / Upsidedown jellyfish {Cassiopeia andromeda} Papua New Guinea

Jeff Rotman / Lions mane jellyfish (Cyanea capillata) USA atlantic

Pete Oxford / Flat worm on tree bark {Tricladida} Madagascar

Juergen Freund / Upsidedown jellyfish (Cassiopeia sp) Caribbean