so this little marine critter is the famous siphonophore (NOT A JELLYFISH) Portuguese Man O’ War

such a cute baby alien, This Physalia physalis was stranded at Olivencia beach, Bahia - Brazil, scaring misunderstood people who didnt appreciate her beauty

A Siphonophore  is any of various transparent, often subtly colored marine hydrozoans of the order Siphonophora, consisting of a floating or swimming colony of polyp-like and medusa-like individuals.


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Not much is known about this mysterious species, measuring 50 cm long and has a powerful sting that can be felt in the water surrounding the creature.

The incredibly rare Crambione cookii had not been seen since 1910, but has recently been discovered on the coast of Queensland, Australia, where he was captured.

His sketch has so far been the only record of the living creature and has even been used to help identify the animal by jellyfish expert Lisa-Ann Gershwin, who confirmed the existence of this unusual marine inhabitant after he was captured.


Pulse Corals are unique in that they’re constantly in motion!

Their polyps are long and thin and topped by eight tentacles which rhythmically open and close all day and all night.

It has nothing to do with capturing prey, for these corals get almost all their food from symbiotic, photosynthesising zooxanthellae.

It seems the pulsing actually assists those same photosynthetic microbes. It helps the coral get rid of oxygen so that their guests can better get to work turning sunlight into food.

It also happens to be rather mesmerising!

…Videos: 1, 2


Blue Button (Porpita porpita)

…a species of colonial porpitid hydrozoans which occur in tropical and sub-tropical waters of the Pacific, Atlantic, and Indian Oceans. Although blue buttons look similar to jellyfish they are actually a colony of numerous hydrozoan polyps. Blue buttons are typically seen drifting on the surface of the ocean where it feeds on zooplankton which drift too close. Blue button colonies consist of two main parts: the float which is a hard brown circle which keeps the colony afloat, and the colony which forms the “tentacles” of the organism, these tentacles are laced with nematocysts which are used to dispatch prey.  


Animalia-Cnidaria-Medusozoa-Hydrozoa-Anthomedusae-Porpitidae-Porpita-P. porpita

Images: Bruce Moravchik and Tanay PrabhuDesai


Here’s a sweet little siphonophore bobbing around in the deep sea!

Siphonophores are members of the phylum Cnidaria, like jellyfish, sea anemones and corals.

They’re colonial animals. What you see here is not one, single individual, but an entire army of sea anemones and jellyfish all stuck together.

The sea anemones (or polyps) are at the bottom and use their stinging tentacles to catch food.

The jellyfish (or medusae) are at the top, where they pulse and beat away so that the whole gang can get around.

The Golden Horde is back! And this time they’re kinda cute.

…Video: Inner Space Centre



(Velella velella)

also known as the sea raft or the by-the-wind sailor, the velella is a small species of free floating hydrozoan found in open waters worldwide. While they are not a siphonophore like the Man o’ War they live a similar lifestyle, in that they live on the ocean surface and use a sail for locomotion, and wait for food to move into their tentacles. also like most cnidarians they fall prey to nudibranchs like the blue dragon. They are found mostly on beaches due to the fact that they rely solely on their sail for locomotion, and some times that leads them to their demise.





Deep-sea jellies are as diverse as they are beautiful!

Steve Haddock and his collaborators study these animals because the many remarkable shapes, sizes, colors, and bioluminescence capabilities can help in understanding evolution in the deep-sea, the chemical processes involved in bioluminescence, predator-prey interactions, and biodiversity in the deep midwater.

This Solmissus jelly is probably its deep purple color because of it’s prey—in this case, another purple jelly!

This undescribed species of hydromedusa - Tetrorchis, shows pink pigmentation due to absorbance, and rainbow iridescence due to the thin-film effect of its tissue acting on white incident light from the ROV.

This undescribed physonect, called the galaxy siphonophore by Haddock and his collaborators, is one of the more spectacular of the deep-living species observed this week on the R/V Western Flyer. It is often found in this spiral shape, casting its many tentacles all around like a spider in its web.

(via: Monterey Bay Aquarium Research Institute)