Hydrozoan Collection (page 3)

Periphylla periphylla, helmet jellyfish
Coloured drawing by Edward Adrian Wilson (1872-1912), made on 1 August 1902 during the Discovery Expedition to the Antarctic, 1901-1904. Jellyfish found in the McMurdo Strait

Bythe Wind Sailor Jellyfish (Velella velella) Underside

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

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

Portuguese man-of-war (Physalia physalis) at the waters surface. This organism is a colony composed of many specialised polyps, groups of which form its structures

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

Porpita umbela hydrozoan, light micrograph. This is a small specimen of this colonial marine organism, which consists of a collection of specialised polyps

Obelia hydrozoan medusa, light micrograph
Obelia hydrozoan medusa. Dark-field light micrograph of a medusa (young polyp) from the Obelia geniculata hydroid. The circular shallow semi-bell has solid tentacles on the rim

Hydrozoan medusa (Gonionemus vertens), Japan

Hydrozoa (Ectopleura larynx). Hydrozoa are a type of cnidarian and are related to corals and sea anemones. Photographed in the White Sea, Russia

Hydromedusa. Medusa stage of a Halitholus sp. hydrozoan. Hydromedusae are the sexually reproductive stage of hydrozoan cnidarians

Amphipods inside a hydromedusa. Small crustaceans (Hyperia galba) inside the domed body of a hydromedusa (Sarsia tubulosa). Hydromedusae are the sexually reproductive stage of hydrozoan cnidarians

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

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

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

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

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

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

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

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)

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

Nudibranch (Cratena peregrina) Sardinia, Italy. (RR)
Alan James / SplashdownDirect

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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.