Hydrozoa Collection

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

Hydromedusa / Trachymedusa (Crossota sp) showing tentacles, from approx 2700m, mid Atlantic ridge, June 2010

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)

Long-armed polyp, Hydra longimana (Hydra vulgaris?). Illustration drawn and engraved by Richard Polydore Nodder
FLO4683986 Long-armed polyp, Hydra longimana (Hydra vulgaris?). 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

Hydromedusa / Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010
Hydromedusa/ Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010

Hydromedusa / Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010

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 7 Epibulia Siphonophorae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)
5615752 Plate 7 Epibulia Siphonophorae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

Examples of Siphonophorae from Kunstformen der Natur, 1899 (colour litho)
746699 Examples of Siphonophorae from Kunstformen der Natur, 1899 (colour litho) by Haeckel, Ernst (1824-1919) (after); Private Collection; (add.info.: Siphonophorae or Siphonophora)

Examples of Siphonophorae from Kunstformen der Natur, 1899 (colour litho)
746700 Examples of Siphonophorae from Kunstformen der Natur, 1899 (colour litho) by Haeckel, Ernst (1824-1919) (after); Private Collection; (add.info.: Siphonophorae or Siphonophora)

Plate 6 Tubuletta Tubulariae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)
5615751 Plate 6 Tubuletta Tubulariae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

Plate 26 Carmaris Trachomedusae from Kunstformen der Natur (Art Forms in Nature)
5615743 Plate 26 Carmaris Trachomedusae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

Plate 25 Diphasia Sertulariae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919)
5615742 Plate 25 Diphasia Sertulariae from Kunstformen der Natur (Art Forms in Nature) illustrated by Ernst Haeckel (1834-1919) by Haeckel

Examples of Discomedusae from Kunstformen der Natur, 1899 (colour litho)
746693 Examples of Discomedusae from Kunstformen der Natur, 1899 (colour litho) by Haeckel, Ernst (1824-1919) (after); Private Collection; (add.info)

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

UW INDO 2022 29
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

Siphonophorae hydrozoa: Epibulia ritteriana 1, 2, and Salacella uvaria 3-6. Chromolithograph by Adolf Glitsch from an illustration by Ernst Haeckel from Art Forms in Nature, Kunstformen der Natur

Siphonophorae hydrozoa: Porpema prunella and Porpita species, young and adult colonies, gas bladder, etc. Chromolithograph by Adolf Glitsch from an illustration by Ernst Haeckel from Art Forms in

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

Portuguese Man o War (Physalia physalis) with long, dangling, purple-blue tentacles

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

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

All Professionally Made to Order for Quick Shipping

Hydrozoa, a fascinating class of marine animals, encompasses a diverse range of species that inhabit oceans worldwide. From the venomous Portuguese man o war drifting along the shores of Tenerife in the Canary Islands to the mesmerizing Hydromedusa with its intricate tentacles found deep beneath the surface near the mid-Atlantic ridge, Hydrozoa never fails to captivate. The Portuguese man o war (Physalia physalis) is an iconic representation of Hydrozoa's beauty and danger. Its vibrant colors and long tentacles make it both alluring and deadly. Incredibly, there are creatures like the Man-of-war fish (Nomeus gronovi) that live within these perilous tentacles, displaying an astonishing resistance to their toxin. Not only do some organisms coexist with Hydrozoa but others even prey upon them. The Blue dragon seaslug (Glaucus atlanticus), immune to their venom, feasts on Indo-Pacific Portuguese man-of-war washed ashore during mass strandings. This unique adaptation allows them to thrive while other creatures succumb. Hydra viridissima, commonly known as green hydra, can be found in garden ponds across Derbyshire in the UK. These small yet captivating creatures add a touch of enchantment to any aquatic environment they inhabit. Venturing into deeper waters reveals more wonders within this class. Crystal jellyfish (Aequorea victoria) gracefully float through Trondheimsfjord in Norway's Atlantic Ocean depths. Their translucent bodies emit an ethereal glow that illuminates their surroundings with an otherworldly radiance. From vibrant Red Sea coral reefs teeming with Scalefin anthias fish to top-down views of Indo-Pacific Portuguese Man-of-War colonies stretching across South Africa's coastline—these images showcase just how diverse and awe-inspiring Hydrozoa truly is.