Adult jelly fish

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Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa , a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles , although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle ; the medusa is normally the sexual phase, which produces planula larva that disperse widely and enter a sedentary polyp phase before reaching sexual maturity.
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Smithsonian Ocean

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The life cycle of a jellyfish: Spawning, cloning and immortality

When you think of a jellyfish, you are probably picturing a translucent, bell-shaped animal with long flowing tentacles. While iconic, that's only a short stage of a jelly's life - the "medusa" phase of a true scyphozoan jellyfish before it dies. Jellyfish live far longer, more interesting lives than you may have imagined! Let's take a look at the incredible life cycle of jellyfish; for consistency, we're going to be using images of Aurelia moon jellies as much as possible:. The life story of a jelly begins just like ours - with a male and a female looking for a chance to mate. At dusk or dawn, adult jellies, known as medusae, gather in large numbers to spawn.
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The Life Cycle of a Jellyfish

Jellyfish reproduction involves several different stages. In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula. In this larval stage of jellyfish life, the planula hooks on to the bottom of a smooth rock or other structure and grows into another stage of jellyfish life, the polyp--which resembles a miniature sea anemone. During this stage, which can last for several months or years, asexual reproduction occurs. The polyps clone themselves and bud, or strobilate, into another stage of jellyfish life, called ephyra.
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True jellyfish have a complex life cycle that allows them to quickly take advantage of favorable environmental conditions. This is achieved by alternating with each generation between reproducing sexually with sperm fertilizing eggs and asexually by cloning themselves. In the Chesapeake Bay, sea nettle medusae will release eggs and sperm into the water throughout the late summer.
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