Hydrozoan Collection

Portuguese man o war (Physalia physalis) Tenerife, Canary Islands

Man-of-war fish (Nomeus gronovi) living within deadly tentacles of Portuguese man o war (Physalia physalis), to whose toxin it is ten times more resistant than other fish, at sea surface. Dominica

Physalia pelagica, Portugese-man-of-war
Illustration by Rene Primevcre Lesson from Voyage of the Coquille (1826-1338)

Blue dragon seaslug (Glaucus atlanticus) with Blue button hydroid colony (Porpita porpita) on which it feeds. Tenerife, Canary Islands. October

Blue sea slug (Glaucus atlanticus) that was washed ashore with a mass, multi-day stranding of thousands of Indo-Pacific Portuguese man-of-war (Physalia utriculus)

Siphonophore (Nanomia sp) close up of nectophores, and palpons. Gulf of Maine, Atlantic Ocean. Epipelagic species found up to 300m depth

Green hydra (Hydra viridissima) found in a garden pond. Derbyshire, UK. September. Winner of the Hidden Britain Category of the British Wildlife Photographer of the Year Awards (BWPA) Competition 2017

RF - A vibrant Red Sea coral reef scene, with orange female Scalefin anthias fish (Pseudanthias squamipinnis) teeming over Fire coral (Millepora dichotoma)

Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda

Crystal jellyfish (Aequorea victoria) in deep water, Trondheimsfjord, Norway, Atlantic Ocean

Portuguese man o war (Physalia physalis) Tenerife, Canary Islands. January

Top-down view of an Indo-Pacific Portuguese Man-of-War (Physalia utriculus). This is one of many thousands that were part of a mass stranding in South Africa. Atlantic ocean

School of Scalefin anthias (Pseudanthias squamipinnis) females, swimming around Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents, Ras Mohammed National Park

Portuguese man o war (Physalia physalis) floating on sea surface. Azores, Atlantic Ocean

Male Emperor angelfish (Pomacanthus imperator) swimming over garden of Fire corals (Millepora sp)
Male Emperor angelfish (Pomacanthus imperator) swimming over garden of Fire corals (Millepora sp.) in morning sunshine, Ras Mohammed National Park, Sinai, Egypt, Red Sea

Emperor angelfish (Pomacanthus imperator) swimming in front of Fire corals (Millepora dichotoma) and soft corals (Dendronephthya sp.) and (Scleronephthya sp)

Blade fire coral (Millepora complanata) colonies breaking wave, protection against hurricanes. Guanaja Island, Honduras. Caribbean Sea

Juvenile Damselfish (Stegastes) hiding amongst Blade fire coral (Millepora complanata). Roatan Island, Honduras. Caribbean Sea

Common hermit crab (Pagurus bernhardus) with Snail fur (Hydractinia echinata) growing on its shell, close up, Ronas Voe, Shetland, Scotland, North Atlantic Ocean, UK

Naked-eye medusa, Orythia viridis, Oritia verde 1, and hydrozoans, Geryonia proboscidalis, Dianea gabert 2
6338519 Naked-eye medusa, Orythia viridis, Oritia verde 1, and hydrozoans, Geryonia proboscidalis, Dianea gabert 2, and Liriope tetraphylla

Portuguese man o war, Physalia physalis
6338335 Portuguese man o war, Physalia physalis by Corsi (19th century); (add.info.: Portuguese man o war, Physalia physalis (Fisalia pelagica)

Sea raft, by-the-wind sailor, purple sail, little sail, Velella velella
6337576 Sea raft, by-the-wind sailor, purple sail, little sail, Velella velella by Corsi (19th century); (add.info.: Sea raft, by-the-wind sailor, purple sail, little sail, Velella velella. 1, 2)

Upside-down jellyfish, Cassiopea frondosa 1, Melicertum species 2 and obelia polyp 3
6337563 Upside-down jellyfish, Cassiopea frondosa 1, Melicertum species 2 and obelia polyp 3 by Corsi (19th century); (add.info.: Upside-down jellyfish, Cassiopea frondosa 1)

Freshwater green hydra (Hydra viridissima) moving over a petri dish. Green colour comes from the symbiotic relationship with green alga Chlorella vulgaris

UW INDO 2028 22
Amphipod on hydroid - Segara dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Amphipod on hydroid - Segara dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean

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Black Wrasse by Hydroids - Emerald dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean Black Wrasse by Hydroids - Emerald dive site, Seraya, Karangasem, Bali, Indonesia, Indian Ocean

Mutualism between a Portuguese man o war (Physalia physalis) and a juvenile Imperial blackfish (Schedophilus ovalis), Tenerife, Canary Islands

Basket star or gorgons head, Astrocladus euryale, Euriale a costole lisce. Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze Naturali

Mediterranean snakelocks sea anemone, Anemonia sulcata. (Actinia viridis, Attinia verde). Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze

Cotton-spinner or tubular sea cucumber, Holothuria tubulosa. Oloturia tubulosa. Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze Naturali

Naked-eye medusa and hydrozoan jellyfish
Naked-eye medusa, Orythia viridis, Oritia verde 1, and hydrozoans, Geryonia proboscidalis, Dianea gabert 2, and Liriope tetraphylla, Gerionia tetrafilla 3

Disc jellyfish species, Eudora ondulosa disopra. Handcoloured copperplate stipple engraving from Antoine Laurent de Jussieus Dizionario delle Scienze Naturali, Dictionary of Natural Science

Blue button, Porpita porpita (Nummular medusa, Medusa nummularia). Illustration drawn and engraved by Richard Polydore Nodder

Narcomedusae jellyfish: Pegantha pantheon 1, 2, Aeginura grimaldii 3, Pegantha godeffroyi 4, golf tee medusa, Aegina citrea 5, 6, 7, Aegina species 8, and Cunina octonaria 9

Tiny hydrozoa, which is a predatory jellyfish-like animal. The hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria, Green Island, Taiwan

Diverse hard coral growth (Pocillopora damicornis, Pocillopora verrucosa and Millepora dichotoma), flourishes beneath the barren desert cliffs in the Red Sea. Ras Katy, Sinai, Egypt

Moon jelly (Aurelia labiata) and Cross jellies (Mitrocoma cellularia) split level view in Browning Pass, Queen Charlotte Strait, British Columbia. October

Carmarina hastata, jellyfish model
A glass model of a jellyfish, created by Leopold and Rudolf Blaschka in the late nineteenth century and held at the Natural History Museum, London

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

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

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

Physalia pelagica, jellyfish model
A glass model of a jellyfish, created by Leopold and Rudolf Blaschka in the late nineteenth century and held at the Natural History Museum, London

Chrysaora isosceles, jellyfish model
A glass model of a jellyfish, created by Leopold and Rudolf Blaschka in the late nineteenth century and held at the Natural History Museum, London

Picture No. 11014594
Beadlet Anenome a marine hydrozoan coelenterate common in rock pools (Actinia equinae) Date:

Hydra budding, SEM
Hydra budding. Coloured scanning electron micrograph (SEM) of a Hydra sp. freshwater hydrozoan budding. Hydra commonly reproduce by budding - a form of asexual reproduction in which a new organism

Hydra budding C014 / 4856
Hydra budding. Coloured scanning electron micrograph (SEM) of a Hydra viridis freshwater hydrozoan. Hydra viridis commonly reproduces by budding, as seen here

Amphiroa - Anatomy of calycophoridae
Plate 5 from The Oceanic Hydrozoa 1859 by T. H. Huxley

Picture No. 11993254
Portuguese Man of War - Isles of Scilly - UK Date:

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The hydrozoan, also known as the Portuguese man o war (Physalia physalis), is a fascinating creature found in various parts of the world. In Tenerife, Canary Islands, one can witness the stunning beauty of this marine organism. With its vibrant colors and long tentacles trailing behind it, the Physalia physalis floats gracefully on the ocean's surface. But beware. The allure of this creature hides its deadly nature. Its venomous tentacles can deliver excruciating pain to anyone unfortunate enough to come into contact with them. However, there are some exceptions to this rule. The Man-of-war fish (Nomeus gronovi) fearlessly resides within these dangerous tentacles, displaying an incredible resistance to their toxin that surpasses other fish by tenfold. In Dominica, Caribbean Sea, Atlantic Ocean, another remarkable sight awaits - the Blue dragon seaslug (Glaucus atlanticus). This tiny sea slug showcases a striking blue coloration and is often found alongside a Blue button hydroid colony (Porpita porpita). Interestingly enough, both species have evolved to prey upon Indo-Pacific Portuguese man-of-war (Physalia utriculus) and possess immunity against their venom. Moving away from oceans and towards garden ponds in Derbyshire, UK. , we encounter Green hydra (Hydra viridissima). These freshwater hydrozoans add a touch of enchantment with their vivid green appearance amidst aquatic plants. Venturing deeper into the depths of Trondheimsfjord in Norway's Atlantic Ocean reveals yet another captivating hydrozoan - Crystal jellyfish (Aequorea victoria). Illuminated by bioluminescence in deep waters, these translucent creatures create an ethereal spectacle that leaves viewers mesmerized.