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Hula Skirt Siphonophore (Physophora hydrostatica)

…a species of deep sea siphonophore that is widespread in the Atlantic, Pacific and Indian Oceans. Like all siphonophores P.hydrostatica is not a single animal but a colony of hundreds of small animals, known as zooids, that are working together to function. The top portion of the colony holds the swimming bells which allow the colony to move. It also contains float bells which allow the colony float by changing the amount of gas in these bells, the float bell has a pore at the bottom that emits gas and can be refilled with secretions from a gland.

The bottom of the colony holds the orange ‘hula skirt’ which is full of stinging tentacles which are used to dispatch prey via a painful sting. The colony also has a long thread at the base which holds all the individuals that do specialized tasks.

Phylogeny

Animalia-Cnidaria-Hydrozoa-Siphonophorae-Physonectae-Physophoridae-Physophora-hydrostatica

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Apolemia uvaria

…a species of Apolemiid Siphonophore that can be found worldwide, but is most common in the Mediterranean, North-East Atlantic, and areas around Australia and New Zealand. Although A. uvaria is sometimes called a jellyfish it is actually a type of colonial hydrozoan, which consists of many polyps living together in a ‘colony’. Like other siphonophores Apolemia uvaria is a predator and will feed on pelagic zooplankton which are dispatched with stinging tentacles. The polyps in A. uvaria colonies are specialized to preform different tasks, most of the colony consists of stinging tentacles with a gas float and swimming bells at the front. 

Classification

Animalia-Cnidaria-Hydrozoa-Siphonophorae-Physonectae-Aoplemiidae-Apolemia-A. uvaria

Image: Seascapeza

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