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.

Jellyfish - Neoturris pileata

Medusae of the hydrozoan Neoturris pileata (Anthoathecata - Pandeiidae) are identifiable by their bell-shaped umbrella, higher than wide, with variable solid apical projection, and also by the structure of the gonad with its inwardly directed horizontal folds and isolated interradial pits.

This species occurs in the North Atlantic Ocean, North Sea, Mediterranean Sea, and Philippines in the Pacific Ocean.

References: [1] - [2]

Photo credit: ©Tony J. Gilbert | Locality: Oban, Scotland (2012)

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Purple jellyfish | ©Frédéric Lechat   (Belle-Île, France)

Pelagia noctiluca (Semaeostomeae - Pelagiidae) is a jellyfish found in the Northeastern Atlantic, Mediterranean, Indian Ocean, and western and central Pacific. Sometimes it is commonly named Mauve stinger.

These jellyfishes are beautiful, especially when they phosphoresce. The Mauve stinger glows by producing luminous mucus from surface cells when it is knocked or disturbed by waves.

Unlike most jellyfish, the life cycle of the mauve stinger does not involve a fixed stage.




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.


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


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

Anthopleura elegantissima, Aggregating Anemone | ©Marlin Harms (North Point, Morro Strand State Beach, Morro Bay, California, US)

This colonial anemone with tentacles greenish to pinkish, can be found on rocky, tide swept shores along the Pacific coast of North America.

An interesting fact of these anemones, recently studied, is that High-intertidal individuals are exposed aerially up to 18 h each day, unlike low-intertidal individuals which may be continuously immersed over many days [read more].

Animalia - Cnidaria - Anthozoa - Hexacorallia - Actiniaria - Actiniidae - Anthopleura - A. elegantissima

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(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.





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