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