Wild Wonders of Europe / Zankl / Painted comber (Serranus scriba) amongst Posidonia, Malta, Mediteranean, May 2009

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

Jose B. Ruiz / Neptune grass bed {Posidonia oceanica} Mediterranean.

Jose B. Ruiz / Neptune seagrass {Posidonia oceanica} forms large prairies of grass in well lit seabeds. Mediterranean

Angelo Gandolfi / Neptune grass (Posidonia oceanica) Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain.

Angelo Gandolfi / Neptune grass (Posidonia oceanica) Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain.

Angelo Gandolfi / Neptune grass (Posidonia oceanica) Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain.

Angelo Gandolfi / Pointed-snout wrasse (Symphodus rostratus) in Neptune grass (Posidonia oceanica) prairie, Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain.

Angelo Gandolfi / Schooling Damselfish (Chromis chromis) over Neptune grass (Posidonia oceanica) Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain

Angelo Gandolfi / Boat over on the Mediterranean sea with patches of darker waters showing beds of Mediterranean seagrass (Posidonia oceanica), Western Mediterranean Sea, Ibiza UNESCO World Heritage Site, Spain

Jiri Lochman / Ribbon grass (Posidonia australis), Shark Bay UNESCO Natural World Heritage Site, Western Australia.

Jiri Lochman / Ribbon grass (Posidonia australis), Shark Bay UNESCO Natural World Heritage Site, Western Australia.

Jiri Lochman / Ribbon grass (Posidonia australis), Shark Bay UNESCO Natural World Heritage Site, Western Australia.

Jiri Lochman / Ribbon grass (Posidonia australis), Shark Bay UNESCO Natural World Heritage Site, Western Australia.

Jiri Lochman / Ribbon grass (Posidonia australis), Shark Bay UNESCO Natural World Heritage Site, Western Australia.

Alex Mustard / Long snouted seahorse (Hippocampus guttulatus) hiding in seagrass (Posidonia oceanica). Capo Galera, Alghero, Sardinia, Italy. Mediterranean Sea.

Inaki Relanzon / Neptune grass bed {Posidonia oceanica} Mediterranean Sea.

Inaki Relanzon / Neptune grass bed (Posidonia oceanica), Mediterranean Sea.

Alex Mustard / Cushion star (Asterina pancerii), juvenile backlit through a blade of seagrass (Posidonia oceanica). Punto Saline, Olbia, Sardinia, Italy. Tyrrhenian Sea, Mediterranean Sea. Endangered species.

MYN / Dimitris Poursanidis / Part of a dead marine plant (Posidonia oceanica), beached material, Heraklion, Crete, Greece meetyourneighbours.net project

MYN / Dimitris Poursanidis / Part of a dead marine plant (Posidonia oceanica), beached material, Heraklion, Crete, Greece meetyourneighbours.net project

Franco Banfi / Seagrass Meadows (Posidonia oceanica) close to Teti wreck, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Seagrass meadow of Neptune grass (Posidonia oceanica), Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Inflorescence of Neptune grass (Posidonia oceanica) seagrass meadow, Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Pen shell (Pinna nobilis) in seagrass meadow of Nepture grass (Posidonia oceanica), Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Neptune grass (Posidonia oceanica) with flower, and encrusting algae, Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Alex Mustard / A common cuttlefish (Sepia officinalis) above seagrass meadow (Posidonia oceanica). Xlendi Bay, Gozo Island, Malta, Mediterranean Sea.

Roberto Rinaldi / View through Neptune grass (Posidonia oceanica) to underside of boat on surface. Capraia, Tuscany, Italy, August.

Wild Wonders of Europe / Banfi / Artificial reef submerged in between Neptune grass (Posidonia oceanica) on the seabed, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Jose B. Ruiz / Neptune grass {Poisidonia oceanica} washed up on beach, Vistamar beach, Pilar de la Horadada, Alicante, Spain

Jose B. Ruiz / Neptune grass {Poisidonia oceanica} washed up on beach, Vistamar beach, Pilar de la Horadada, Alicante, Spain

Jose B. Ruiz / View along Beach, Isla de Tabarca, Alicante, Spain, With dead Posidonia washed up on shore

Jean E. Roche / "Balls" of Posidonia (Posidonia sp.) detritus washed up on beach, Corsica, France

Adrian Davies / Balls of fibrous remains of Neptune grass {Posidonia oceanica} Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Neptune grass bed {Posidonia oceanica} Mediterranean. Spain.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica} held in hand, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica} held in hand, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica} held in hand, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Single Neptune grass stem and root {Posidonia oceanica}, Mediterranean.

Jose B. Ruiz / Neptune grass {Posidonia oceanica} washed up on beach. Spain Mediterranean

Jose B. Ruiz / Neptune grass growing on seabed {Posidonia oceanica} Mediterranean

Jose B. Ruiz / Neptune grass waving in underwater currents {Posidonia oceanica} Mediterranean

Jose B. Ruiz / Neptune grass on seabed {Posidonia oceanica} Tabarca Is Spain Mediterranean

Jose B. Ruiz / Neptune grass on seabed {Posidonia oceanica} Tabarca Is Spain Mediterranean

Francis Abbott / Neptune grass flowers {Posidonia oceanica} Menorca

Francis Abbott / Neptune grass {Posidonia oceanica} Mediterranean

Francis Abbott / Neptune grass flowers {Posidonia oceanica} Menorca

Francis Abbott / Neptune grass flowers {Posidonia oceanica} Menorca,

Jose B. Ruiz / Neptune seagrass {Posidonia oceanica} forms large prairies of grass in well lit seabeds. Mediterranean Spain

Sue Daly / Neptune grass off Costa Brava, Spain Medes Isles

Florian Graner / Common cuttlefish {Sepia officinalis} amongst Posidonia seaweed, Mediteranean, Corsica

Jose B. Ruiz / Maned seahorse {Hippocampus ramulosus} Spain

Roberto Rinaldi / Mediterranean feather star (Antedon mediterranea) on neptune grass (Posidonia oacaenica), Elba, Italy.

Paul Harcourt Davies / Neptune balls (Posidonia oceanica), balls of fibrous material from the foliage of Neptune grass, washed up on beach, Tyrrhenian coast, Italy. September.

Franco Banfi / Morey eel (Muraena helena) in seagrass meadow (Posidonia oceanica) Punta Carena, Capri Island, Sorrentine Peninsula, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Seagrass meadows (Posidonia oceanica), Punta Campanella Marine Protected Area, Amalfi Coast, Italy, Tyrrhenian Sea, Mediterranean.

Shane Gross / Neptune seagrass (Posidonia oceanica) with oxygen bubbles on blades. Seagrass beds absorb and store carbon 35 times more efficiently than rainforests helping the fight against climate change. 1m2 of S...

Shane Gross / Bryozoans (Electra posidoniae and Patinella radiata) on Neptune seagrass (Posidonia oceanica) blade, close up. When including this level of organism seagrass beds rival rainforests in their biodiversi...

Shane Gross / Sea snail (Gastropoda) eggs and Bryozoans (Electra posidoniae) on Neptune seagrass (Posidonia oceanica) blade, close up. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica). A patch of this seagrass bed is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed with Fish shoaling above. A patch of this seagrass bed is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed. A patch of this seagrass bed is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed with Fish shoaling above. A patch of this seagrass bed is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Sun rays shining onto Neptune seagrass (Posidonia oceanica) bed. A patch of this seagrass bed is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, illuminated by sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spai...

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Neptune seagrass (Posidonia oceanica) bed, sun rays shining through water. A patch of seagrass bed in the Mediterranean sea is considered to be the oldest living organism on earth. Spain. June.

Shane Gross / Mediterranean rainbow wrasse (Coris julis) sheltering in Neptune seagrass (Posidonia oceanica) bed. Spain. June.

Alex Mustard / Noble pen shell (Pinna nobilis), a large bivalve shell (this individual was about 60cm) endemic to the Mediterraean, grows vertically in a Mediterranean sea grass (Posidonia oceanica) meadow. Costa Pa...

Dimitris Poursanidis / Close up of the shield and leaves of Neptune seagrass (Posidonia oceanica), endemic to the Mediterranean Sea, Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / Erosion of Neptune seagrass (Posidonia oceanica), Southern Crete, Greece. Human activities can cause erosion of seagrass meadows, which releases the stored carbon into the water column and the atmosph...

Dimitris Poursanidis / Close up of the flower of Neptune seagrass (Posidonia oceanica), Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / A researcher collects data from the seagrass meadows (Posidonia oceanica) in the Samaria National Park, Chania, Crete. The continous monitoring of the ecological status of the seagrass meadows is an i...

Dimitris Poursanidis / Meadow of Neptune seagrass (Posidonia oceanica), Chersonissos, Heraklion, Crete, Greece

Dimitris Poursanidis / Neptune's seagrass (Posidonia oceanica) meadow damaged by repeated anchorage by leisure boats. National Marine Park of Alonissos, Northern Sporades, Greece

Dimitris Poursanidis / A researcher collecting data from the seagrass meadows (Posidonia oceanica), Sigri, Lesvos, North Aegean. The continous monitoring of the ecological status of the seagrass meadows is an inherent part...

Dimitris Poursanidis / Comber (Serranus cabrilla) sheltering within Neptune seagrass (Posidonia oceanica). Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / Black-tailed wrasse (Symphodus melanocercus) sheltering within Neptune seagrass (Posidonia oceanica). Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / Berried anemone (Alicia mirabilis) attached to a blade of Neptune seagrass (Posidonia oceanica), Skyros, North Aegean, Greece

Dimitris Poursanidis / Ocellated wrasse (Symphodus ocellatus) sheltering in Neptune seagrass (Posidonia oceanica) meadow, Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / Neptune seagrass (Posidonia oceanica) meadow, Samaria National Park, Chania, Crete, Greece

Dimitris Poursanidis / A school of siganids (Siganus rivulatus) above Neptune seagrass (Posidonia oceanica) meadow, Agia Pelagia, Heraklion, Crete, Greece

Dimitris Poursanidis / Close up of the leaves of Neptune seagrass (Posidonia oceanica), Skyros, North Aegean, Greece.

Dimitris Poursanidis / The Noble pen shell (Pinna nobilis) is the largest bivalve that lives in the Mediterranean. It is mostly found in seagrass meadows (Posidonia oceanica), Skyros, North Aegean, Greece.

Dimitris Poursanidis / A school of Mediterranean chromis (Chromis chromis) swimming above Neptune seagrass (Posidonia oceanica) meadow, Skyros, North Aegean, Greece.