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Hydrozoans Collection

Hydrozoans, also known as hydrozoa, are fascinating creatures that inhabit the depths of our oceans

Background imageHydrozoans Collection: Plate 16 Pegantha Narcomedusae from Kunstformen der Natur (Art Forms in Nature)

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

Background imageHydrozoans Collection: Skeleton shrimp (Caprellidea sp) on a hydroid, Saltstraumen, Bod, Norway, October 2008

Skeleton shrimp (Caprellidea sp) on a hydroid, Saltstraumen, Bod, Norway, October 2008

Background imageHydrozoans Collection: Portuguese man-of-war (Physalia physalis) on the water surface, Pico, Azores, Portugal

Portuguese man-of-war (Physalia physalis) on the water surface, Pico, Azores, Portugal, June 2009

Background imageHydrozoans Collection: Portuguese man of war (Physalia physalis) Pico, Azores, Portugal, June 2009

Portuguese man of war (Physalia physalis) Pico, Azores, Portugal, June 2009

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

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

Background imageHydrozoans Collection: Hydra budding, SEM

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

Background imageHydrozoans Collection: Hydra budding C014 / 4856

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

Background imageHydrozoans Collection: By-the-wind Sailor (Velella velella) group, held in human hand, washed up on beach, Cornwall

By-the-wind Sailor (Velella velella) group, held in human hand, washed up on beach, Cornwall, England, November

Background imageHydrozoans Collection: Hydroid (Candelabrum cocksi) Kimmeridge, Dorset, England, November (captive)

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

Background imageHydrozoans Collection: Hydra, SEM

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

Background imageHydrozoans Collection: Green hydra, light micrograph C014 / 4680

Green hydra, light micrograph C014 / 4680
Green hydra. Darkfield illuminated light micrograph of the tentacled head of a green hydra (Hydra viridis). Hydra are small simple predatory fresh-water animals, belonging to the phylum Cnidaria

Background imageHydrozoans Collection: Green hydra, light micrograph C014 / 4681

Green hydra, light micrograph C014 / 4681
Green hydra. Darkfield illuminated light micrograph of a green hydra (Hydra viridis), showing its tentacled head. Hydra are small simple predatory fresh-water animals

Background imageHydrozoans Collection: Green hydra, light micrograph C014 / 4678

Green hydra, light micrograph C014 / 4678
Green hydra. Light micrograph of the tentacled head of a green hydra (Hydra viridis). Hydra are small simple predatory fresh-water animals, belonging to the phylum Cnidaria

Background imageHydrozoans Collection: Green hydra, light micrograph C014 / 4679

Green hydra, light micrograph C014 / 4679
Green hydra. Darkfield illuminated light micrograph of a green hydra (Hydra viridis), showing its tentacled head. Hydra are small simple predatory fresh-water animals

Background imageHydrozoans Collection: Red Sea bannerfish on a reef

Red Sea bannerfish on a reef. Red Sea bannerfish (Heniochus intermedius) sheltering behind net fire coral (Millepora dichotoma) on a reef

Background imageHydrozoans Collection: Lyretail anthia on a reef

Lyretail anthia on a reef. Male lyretail anthia (Pseudanthias squamipinnis) with net fire coral (Millepora dichotoma) on a reef

Background imageHydrozoans Collection: Brown Hydra (Hydra oligactis) adult, filter feeding with tentacles extended

Brown Hydra (Hydra oligactis) adult, filter feeding with tentacles extended, attached to piece of gravel underwater, Belvedere, Bexley, Kent, England

Background imageHydrozoans Collection: Green Hydra (Chlorohydra viridissima) adult, in process of asexual reproduction by budding off new

Green Hydra (Chlorohydra viridissima) adult, in process of asexual reproduction by budding off new animal, attached to piece of gravel underwater, Belvedere, Bexley, Kent, England

Background imageHydrozoans Collection: Hydroid (Obelia geniculata) Hydranths, gonothecal & a medusa just released

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

Background imageHydrozoans Collection: Bythe Wind Sailor Jellyfish (Velella velella) Underside

Bythe Wind Sailor Jellyfish (Velella velella) Underside

Background imageHydrozoans Collection: Hydra (Hydra viridis) two, with tentacles extended, Italy, june

Hydra (Hydra viridis) two, with tentacles extended, Italy, june

Background imageHydrozoans Collection: Portuguese Man of War (Physalia physalis) floating on ocean surface, Azores, august

Portuguese Man of War (Physalia physalis) floating on ocean surface, Azores, august

Background imageHydrozoans Collection: Hydra (Hydra viridis) with tentacles extended, Italy, june

Hydra (Hydra viridis) with tentacles extended, Italy, june

Background imageHydrozoans Collection: Jellyfish - By-the-wind-Sailor (Velella velella) Stranded on sea shore

Jellyfish - By-the-wind-Sailor (Velella velella) Stranded on sea shore

Background imageHydrozoans Collection: Historical microscope, artwork

Historical microscope, artwork
Historical microscope. 18th Century artwork of a microscope designed to observe aquatic organisms. This device was invented by the Swiss naturalist Abraham Trembley (1710Ôé¼" 1784) in 1747

Background imageHydrozoans Collection: Lyretail anthias and coral

Lyretail anthias and coral
Lyretail anthias. Female lyretail anthias, or goldies, (Pseudanthias squamipinnis) with fire coral. Photographed in the Red Sea, Egypt

Background imageHydrozoans Collection: Hydrozoan colony

Hydrozoan colony. Close-up of the tentacled feeding structures of a hydrozoan (Tubularia larynx) colony. Hydrozoa are a type of cnidarian and are related to corals and sea anemones

Background imageHydrozoans Collection: Nudibranch eating hydrozoa

Nudibranch eating hydrozoa
Nudibranch (Flabellina verrucosa) eating hydrozoa (Eudendrium sp.). Nudibranchs are shell-less marine molluscs that live in seas around the world

Background imageHydrozoans Collection: Fish eggs

Fish eggs. Close-up of fish eggs (white spheres) on a hydrozoan colony (plant-like) with skeleton shrimps (translucent). Hydrozoa are a type of cnidarian that are related to corals and sea anemones

Background imageHydrozoans Collection: Hydrozoan colony and amphipods

Hydrozoan colony and amphipods. Amphipod (Stenothoe marina) crustaceans sheltering amongst the tentacled feeding structures of a hydrozoan (Tubularia larynx) colony

Background imageHydrozoans Collection: Hydrozoan

Hydrozoan (Tubularia indivisa). Hydrozoa are a type of cnidarian and are related to corals and sea anemones

Background imageHydrozoans Collection: Predators feeding on a hydroid colony

Predators feeding on a hydroid colony
Predators feeding on a hydrozoa colony. Colony of Tubularia larynx hydrozoa that has been destroyed by nudibranchs (Coryphella sp)

Background imageHydrozoans Collection: Pontohi pygmy seahorse

Pontohi pygmy seahorse amongst hydroid colony. Pontohi pygmy seahorses (Hippocampus pontohi) have only recently been described (as of 2010)


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Hydrozoans, also known as hydrozoa, are fascinating creatures that inhabit the depths of our oceans. With their intricate and mesmerizing forms, they have captivated the attention of scientists and artists alike. In Ernst Haeckel's masterpiece "Kunstformen der Natur, " Plate 16 showcases the stunning Pegantha Narcomedusae. These hydrozoans display a delicate beauty that is both enchanting and mysterious. Another remarkable sight is the Skeleton shrimp on a hydroid in Saltstraumen, Norway. This symbiotic relationship between two species highlights nature's ability to create harmony even in the most unlikely places. The Portuguese man-of-war, with its vibrant colors and long tentacles floating on water surfaces in Portugal's Azores region, is truly a sight to behold. Its graceful presence commands respect while reminding us of the fragility of life beneath the waves. Witnessing Hydra budding through scanning electron microscopy reveals an incredible process of reproduction. These tiny organisms possess an extraordinary ability to regenerate themselves and continue their lifecycle. By-the-wind Sailor groups washed up on beaches in Cornwall, England evoke curiosity and wonderment. Their collective presence serves as a reminder of how interconnected marine ecosystems truly are. A captive Hydroid named Candelabrum cocksi found in Kimmeridge, Dorset offers researchers an opportunity to study these creatures up close. Understanding their behavior can shed light on their vital role within marine environments. Whether it be encountering Portuguese Man o' Wars floating effortlessly or holding By-the-wind Sailors delicately in human hands, these experiences remind us of our responsibility to protect these fragile ecosystems for future generations. Hydrozoans may seem otherworldly with their unique structures and behaviors but they play an essential part in maintaining balance within our oceans. Let us appreciate their beauty while striving towards preserving their habitats for years to come.