Hydroid 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

Thuiaria pinaster (Pine sertularia, Sertularia pinaster). Illustration drawn and engraved by Richard Polydore Nodder
FLO4683820 Thuiaria pinaster (Pine sertularia, Sertularia pinaster). Illustration drawn and engraved by Richard Polydore Nodder

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

Plate 16 Pegantha Narcomedusae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)
5615761 Plate 16 Pegantha Narcomedusae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

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

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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

Tree hydroid, Eudendrium ramosum (Twisted tubularia, Tubularia ramosa). Illustration drawn and engraved by Richard Polydore Nodder

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

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

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Green sea turtle, Chelonia mydas, and schooling bigeye jacks, Caranx sexfasciatus. Sipidan Island, Malaysia

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

Joined Jellyfish Mirror
Jelly fish mirror from the oceanic coast of California

Picture No. 11072873
Brownstripe Hydroid Shrimp on hydroid Sebayor Point dive site, between Komodo and Flores Islands, Komodo National Park, Indonesia. Brownstripe Hydroid Shrimp

Picture No. 10892928
Stinging Hydroid (Macrorhynchia philippina ) Date:

Common Hermit Crab (Pagurus bernhardus) adult, with Hermit Crab Fur Hydroid (Hydractinia echinata) on shell, on muddy silt in sea loch, Loch Fyne, Argyll and Bute, Scotland, June

Hydroid (Candelabrum cocksi) Kimmeridge, Dorset, England, November (captive)

Hydra, SEM
Hydra budding. Coloured scanning electron micrograph (SEM) of a Hydra sp. freshwater hydrozoan. Hydra catch small swimming crustaceans such as daphnia using stinging

Colourful nudibranch feeding
A colourful nudibranch, Nembrotha rutilans. Feeding on hydroid. On reef at Halmahera, Maluku Islands, Indonesia

CORAL SPRIG. Coral sprig made by hydroids, not more than fiftieth of an inch long. Line engraving, 19th century

Hydroid (Obelia geniculata) Hydranths, gonothecal & a medusa just released

Broad clawed porcelain crab (Porcellana platycheles) covered in a colony of hydroids. Porcelain crabs are decapod (ten legged) crustaceans and not true crabs

Campanularia hydrozoan, light micrograph
Campanularia hydrozoan. Polarised light micrograph of a hydroid colony of Campanularia polyps. The branches of the stem give rise to either feeding polyps (hydranths)

Hydroid (Campanularia flexuosa), LM
Hydroid (Campanularia flexuosa). Light micrograph (LM) of a colonial hydroid, showing gonozooid (reproducing) and gastrozooid (feeding) polyps, attached to a central stolon (stalk)

Freshwater Hydra, light micrograph
Freshwater Hydra. Dark-field light micrograph of a freshwater Hydra on a leaf of Canadian pondweed (Elodea canadensis). The Hydra is undergoing asexual reproduction by budding off a new individual

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Hydroid: Fascinating Creatures of the Ocean From the vibrant waters of Tenerife to the depths of Trondheimsfjord, hydroids have captivated marine enthusiasts with their unique characteristics and remarkable adaptations. These incredible creatures can be found in various parts of the world, each with its own intriguing story. In the Canary Islands, a Portuguese man o' war (Physalia physalis) gracefully floats on the surface, its deadly tentacles trailing beneath. Within these venomous appendages resides an unlikely resident - the Man-of-war fish (Nomeus gronovi). This resilient fish has developed a resistance ten times stronger than any other species, allowing it to coexist harmoniously with its dangerous host. Venturing further into Caribbean waters, we encounter another fascinating relationship between two ocean dwellers. The Blue dragon seaslug (Glaucus atlanticus), adorned in mesmerizing hues, finds solace within a Blue button hydroid colony (Porpita porpita). Together they create an enchanting spectacle that showcases nature's artistic prowess. On distant shores where thousands of Indo-Pacific Portuguese man-of-war wash ashore during a mass stranding event, there exists a creature immune to their venom - the Blue sea slug (Glaucus atlanticus). As if plucked from mythology itself, this tiny slug preys upon these formidable beings without fear or consequence. Closer to home in Derbyshire's garden pond lies yet another marvel - Green hydra (Hydra viridissima). Its delicate form and vivid coloration add beauty to even our most humble surroundings. A reminder that wonders can be found right at our doorstep. Moving across continents to Red Sea coral reefs teeming with life and vibrancy; female Scalefin anthias fish paint orange streaks against an underwater canvas dominated by corals. Amongst them lurks one of nature's masterpieces - Portuguese Man-of-War (Physalia physalis).