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    • Hydrozoa
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Hydromedusa/ Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010 - David Shale
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David Shale / Hydromedusa/ Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010
Siphonophore (Nanomia sp) close up of nectophores, and palpons. Gulf of  Maine, Atlanic Ocean. Epipelagic species found up to 300m depth. - David  Shale
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David Shale / Siphonophore (Nanomia sp) close up of nectophores, and palpons. Gulf of Maine, Atlanic Ocean. Epipelagic species found up to 300m depth.
Red eye medusa (Polyorchis penicillatus) with hitchhiking amphipods (Hyperia medusarum). Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean. - Alex Mustard
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Alex Mustard / Red eye medusa (Polyorchis penicillatus) with hitchhiking amphipods (Hyperia medusarum). Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.
Freshwater jellyfish (Craspedacusta sowerbii) Lake Lugano, Ticino, Switzerland. August. Invasive species. - Franco  Banfi
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Franco Banfi / Freshwater jellyfish (Craspedacusta sowerbii) Lake Lugano, Ticino, Switzerland. August. Invasive species.
Freshwater jellyfish (Craspedacusta sowerbii) Lake Lugano, Ticino, Switzerland. August. Invasive species. - Franco  Banfi
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Franco Banfi / Freshwater jellyfish (Craspedacusta sowerbii) Lake Lugano, Ticino, Switzerland. August. Invasive species.
Portuguese man-of-war (Physalia physalis) colony, underwater Sargasso Sea, Bermuda - Solvin Zankl
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Solvin Zankl / Portuguese man-of-war (Physalia physalis) colony, underwater Sargasso Sea, Bermuda
By-the-wind sailor (Velella velella) colony. Sargasso Sea, Bermuda. - Solvin Zankl
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Solvin Zankl / By-the-wind sailor (Velella velella) colony. Sargasso Sea, Bermuda.
Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda - Solvin Zankl
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Solvin Zankl / Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda
Featherstar (Crinoidea) on red coral (Errina novazelandiae) in Doubtful Sound, Fiordland National Park, New Zealand. - Richard Robinson
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Richard Robinson / Featherstar (Crinoidea) on red coral (Errina novazelandiae) in Doubtful Sound, Fiordland National Park, New Zealand.
Busy coral reef community feeding on plankton, with Scalefin anthias (Pseudanthias squamipinnis), Soft corals (Dendronephthya sp.) and Fire corals (Millepora dichotoma), making up classic Red Sea scen... - Alex Mustard
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Alex Mustard / Busy coral reef community feeding on plankton, with Scalefin anthias (Pseudanthias squamipinnis), Soft corals (Dendronephthya sp.) and Fire corals (Millepora dichotoma), making up classic Red Sea scen...
RF- School of Scalefin anthias (Pseudanthias squamipinnis) on reef in the current feeding on plankton, with soft corals (Dendronephthya spp.) and fire coral (Millepora dichotoma) Jackson Reef, Strait... - Alex Mustard
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Alex Mustard / RF- School of Scalefin anthias (Pseudanthias squamipinnis) on reef in the current feeding on plankton, with soft corals (Dendronephthya spp.) and fire coral (Millepora dichotoma) Jackson Reef, Strait...
Busy coral reef community feeding on plankton, with Scalefin anthias (Pseudanthias squamipinnis), Soft corals (Dendronephthya sp.) and Fire corals (Millepora dichotoma) Ras Mohammed Marine Park, Sinai... - Alex Mustard
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Alex Mustard / Busy coral reef community feeding on plankton, with Scalefin anthias (Pseudanthias squamipinnis), Soft corals (Dendronephthya sp.) and Fire corals (Millepora dichotoma) Ras Mohammed Marine Park, Sinai...
Vibrant Red Sea reef scene, with orange female Scalefin anthias (Pseudanthias squamipinnis) swarming in front of Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents. R... - Alex  Mustard
01472301
Alex Mustard / Vibrant Red Sea reef scene, with orange female Scalefin anthias (Pseudanthias squamipinnis) swarming in front of Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents. R...
Scalefin Anthias (Pseudanthias squamipinnis) swarm over coral reef, with Fire coral (Millepora dichotoma) in the Red Sea in the morning. Yolanda Reef, Ras Mohammed Marine Park, Sinai, Egypt. Gulf of A... - Alex Mustard
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Alex Mustard / Scalefin Anthias (Pseudanthias squamipinnis) swarm over coral reef, with Fire coral (Millepora dichotoma) in the Red Sea in the morning. Yolanda Reef, Ras Mohammed Marine Park, Sinai, Egypt. Gulf of A...
Deep-Sea Jellyfish (Crossota) - Visuals  Unlimited
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Visuals Unlimited / Deep-Sea Jellyfish (Crossota)
A nudibranch (Flabellina nobilis) feeding on a solitary hydroid (Tubularia indivisa), note how the hydroid is bent back as it is pulled into the nudibranch's mouth. Gulen, Bergen, Norway. North East A... - Alex Mustard,Alex  Mustard
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Alex Mustard,Alex Mustard / A nudibranch (Flabellina nobilis) feeding on a solitary hydroid (Tubularia indivisa), note how the hydroid is bent back as it is pulled into the nudibranch's mouth. Gulen, Bergen, Norway. North East A...
Red eye medusa (Polyorchis penicillatus) with its feeding tentacles extended to catch planktonic prey. Note that the bell of the jelly has hitchhiking amphipods (Hyperia medusarum). Browning Pass, Van... - Alex Mustard,Alex  Mustard
01435805
Alex Mustard,Alex Mustard / Red eye medusa (Polyorchis penicillatus) with its feeding tentacles extended to catch planktonic prey. Note that the bell of the jelly has hitchhiking amphipods (Hyperia medusarum). Browning Pass, Van...
Portuquese man o' war (Physalia physalis) colonial siphophore, Tobago, Caribbean. - Michael Pitts,Michael Pitts
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Michael Pitts,Michael Pitts / Portuquese man o' war (Physalia physalis) colonial siphophore, Tobago, Caribbean.
Hydromedusa / Trachymedusa (Crossota sp) showing tentacles, from approx 2700m, mid Atlantic ridge, June 2010 - David Shale
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David Shale / Hydromedusa / Trachymedusa (Crossota sp) showing tentacles, from approx 2700m, mid Atlantic ridge, June 2010
Hydromedusa / Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010 - David Shale
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David Shale / Hydromedusa / Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010
Siphosome of Hydrozoan cnidarian {Stephanomia amphitridis} deep sea, Atlantic. - David Shale
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David Shale / Siphosome of Hydrozoan cnidarian {Stephanomia amphitridis} deep sea, Atlantic.
RF - Split level photo of a coral reef with hard corals (Acropora sp., Millepora sp. and Pocillopora sp.) and the shore with palm trees, at sunset. Red Sea - Alex Mustard
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Alex Mustard / RF - Split level photo of a coral reef with hard corals (Acropora sp., Millepora sp. and Pocillopora sp.) and the shore with palm trees, at sunset. Red Sea
Arrow blenny (Lucayablennius zingaro) peeking out from Fire coral (Millepora dichotoma). Gardens of the Queen National Park, Cuba. - Shane Gross
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Shane Gross / Arrow blenny (Lucayablennius zingaro) peeking out from Fire coral (Millepora dichotoma). Gardens of the Queen National Park, Cuba.
Benthic hydrozoan (Ptychogastria polaris) on seaweed. Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris) on seaweed. Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris). Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris) near iceberg. Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris) near iceberg. Tasiilaq, East Greenland. April.
Benthic hydrozoan (Ptychogastria polaris) in front of iceberg. Tasiilaq, East Greenland. April. - Franco  Banfi
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Franco Banfi / Benthic hydrozoan (Ptychogastria polaris) in front of iceberg. Tasiilaq, East Greenland. April.
Pelagic nudibranch / Blue sea slug (Glaucus atlanticus) along with a much smaller relative, (Glaucilla sp) feeding on a Portuguese man o' war, (Physalia utriculus) Kona, Hawaii, Hawaiian Islands,... - Doug Perrine
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Doug Perrine / Pelagic nudibranch / Blue sea slug (Glaucus atlanticus) along with a much smaller relative, (Glaucilla sp) feeding on a Portuguese man o' war, (Physalia utriculus) Kona, Hawaii, Hawaiian Islands,...
Stinging hydroid (Aglaophenia cupressina). North Sulawesi, Indonesia. - Georgette Douwma
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Georgette Douwma / Stinging hydroid (Aglaophenia cupressina). North Sulawesi, Indonesia.
Stinging hydroid (Aglaophenia cupressina). North Sulawesi, Indonesia. - Georgette Douwma
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Georgette Douwma / Stinging hydroid (Aglaophenia cupressina). North Sulawesi, Indonesia.
Decorator crab (Cyclocoeloma tuberculata) covered with Hydroids (Hydrozoa) to ward off predators. Off Rinca Island and Komodo Island, Indonesia. - David Fleetham
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David Fleetham / Decorator crab (Cyclocoeloma tuberculata) covered with Hydroids (Hydrozoa) to ward off predators. Off Rinca Island and Komodo Island, Indonesia.
Flower hat jelly (Olindias formosus) in Pacific Ocean. Kochi Prefecture, Shikoku, Japan. May. - Tony Wu
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Tony Wu / Flower hat jelly (Olindias formosus) in Pacific Ocean. Kochi Prefecture, Shikoku, Japan. May.
Turritopsis rubra a species of hydrozoan of the family Oceaniidae in the medusa stage of its life cycle, Northern New Zealand. - Richard Robinson
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Richard Robinson / Turritopsis rubra a species of hydrozoan of the family Oceaniidae in the medusa stage of its life cycle, Northern New Zealand.
Freshwater jellyfish (Craspedacusta sowerbii) Angers, France. - Stephane Granzotto
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Stephane Granzotto / Freshwater jellyfish (Craspedacusta sowerbii) Angers, France.
Freshwater jellyfish (Craspedacusta sowerbii) Angers, France. - Stephane Granzotto
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Stephane Granzotto / Freshwater jellyfish (Craspedacusta sowerbii) Angers, France.
Neustonic  jellyfish (Porpita pacifica) at the surface, viewed from above. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean. - Alex Mustard
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Alex Mustard / Neustonic jellyfish (Porpita pacifica) at the surface, viewed from above. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.
Coral reef with Anthias fish (Pseudanthias  squamipinnis), and Fire coral (Millepora dichotoma) Anemone City, Ras Mohammed National Park, Egypt, Red Sea. - Linda Pitkin
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Linda Pitkin / Coral reef with Anthias fish (Pseudanthias squamipinnis), and Fire coral (Millepora dichotoma) Anemone City, Ras Mohammed National Park, Egypt, Red Sea.
Coral reef with Anthias fish (Pseudanthias  squamipinnis), and Fire coral (Millepora dichotoma) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea. - Linda Pitkin
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Linda Pitkin / Coral reef with Anthias fish (Pseudanthias squamipinnis), and Fire coral (Millepora dichotoma) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.
Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) and soft coral,  on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea. - Linda Pitkin
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Linda Pitkin / Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) and soft coral, on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.
Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea. - Linda Pitkin
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Linda Pitkin / Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.
Coral reef with Fire coral (Millepora dichotoma) and anthias (Pseudanthias squamipinnis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea. - Linda Pitkin
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Linda Pitkin / Coral reef with Fire coral (Millepora dichotoma) and anthias (Pseudanthias squamipinnis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.
Staghorn hermit crab (Manucomplanus varians) and Staghorned Hydrocoral (Janaria mirabilis), mutualist species, Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, Jul... - Claudio  Contreras
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Claudio Contreras / Staghorn hermit crab (Manucomplanus varians) and Staghorned Hydrocoral (Janaria mirabilis), mutualist species, Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, Jul...
Blue dragon / Blue seaslug (Glaucus atlanticus) feeding on a Portuguese man o' war (Physalia utriculus)  along with a much smaller relative, Glaucilla sp. (upside down); Glaucus and Glaucilla store th... - Doug Perrine
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Doug Perrine / Blue dragon / Blue seaslug (Glaucus atlanticus) feeding on a Portuguese man o' war (Physalia utriculus) along with a much smaller relative, Glaucilla sp. (upside down); Glaucus and Glaucilla store th...
Hula skirt siphonophore, (Physophora hydrostatica) with eggs, in surface waters of deep open ocean, Kona, Hawaii, USA. - Doug Perrine
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Doug Perrine / Hula skirt siphonophore, (Physophora hydrostatica) with eggs, in surface waters of deep open ocean, Kona, Hawaii, USA.
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