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Medusa or medusoid generation phase of the life cycle of Cnidaria of subtype Medusozoa hydroid scyphoids and jellyfish. Jellyfish body in large part consists of a water-flooded connective tissue mesogloea and is shaped like a bell or umbrella. Such a structure provides the ability to jet propulsion by reducing bell wall muscle. Even the largest whose linear dimensions exceed the meter and the mass of up to several quintals are not able to withstand sea currents therefore considered as part of the plankton.

In trahilid Pelagia and the alternation of generations is lost develops from eggs. Typically jellyfish are formed by budding of polyps and reproduce giving rise to free-swimming larvae planuly. Some hydroid medusa and are capable of asexual reproduction. As a food source using zooplankton including eating eggs and larvae of several species. In turn the themselves victims of adult pelagic fish.

Medusa breathes all over. The gelatinous and transparent body has as many as 24 eyes. By perimeter of the body protrude sensitive cells various pulses sensing medium such as light. Mouth opening is food use and for the removal of her remains. Leftover food is not digested until the end output through the same hole. Around the mouth there are 4 oral blades equipped with stinging cells they also contain scorching substance that serves for the defense and for the production of food. Due to the fact that jellyfish are mainly composed of water its life on land possible. When the washed ashore it dies it dries in the sun.

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