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The term jellyfish broadly corresponds to medusae, [4] that is, a life-cycle stage in the Medusozoa. The American evolutionary biologist Paulyn Cartwright gives the following general definition: Typically, medusozoan cnidarians have a pelagic, predatory jellyfish stage in their life cycle; staurozoans are the exceptions [as they are stalked]. [14]
The developmental stages of scyphozoan jellyfish's life cycle: 1–3 Larva searches for site 4–8 Polyp grows 9–11 Polyp strobilates 12–14 Medusa grows. Most species appear to be gonochorists, with separate male and female individuals. The gonads are located in the stomach lining, and the mature gametes are expelled through the mouth ...
The life cycle of this jellyfish is well known, because it is kept in culture at the Monterey Bay Aquarium. During its life cycle, it alternates between an asexual benthic polyp stage attached to rocks and piers and a sexual planktonic medusa stage that reproduces in the water column; both males and females occur in the plankton form. [13]
There is considerable divergence from the basic life cycle pattern among medusozoans. [11] Scyphozoa is the group commonly known as "true jellyfish" and occur in tropical, temperate and polar seas worldwide. Scyphozoans generally have planula larvae that develop into sessile polyps.
Rhopilema verrilli, the mushroom cap jellyfish, is a species of jellyfish in the family Rhizostomatidae. They are cnidarian invertebrates distinguished by their mushroom-shaped medusae. The species does not have any tentacles; however, they still have stinging cells, called nematocysts , within their bells, which can produce mild stings to humans.
The life cycle of a box jellyfish consists first of sexual reproduction through a medusa (adult jellyfish) releasing sperm or eggs into the open water to fertilize the egg. [10] The fertilized egg will then form into a planula (jellyfish larvae) that will travel around until it colonizes on the seafloor.
Cyanea fulva, the Atlantic lion's mane jellyfish, is a species of jellyfish found along the Mid-Atlantic coastal region of the United States. C. fulva are commonly noted as being about two inches in diameter and smaller than C. capillata , however, larger than C. versicolor , a co-occurring close species.
Craspedacusta sowerbii or peach blossom jellyfish [1] is a species of freshwater hydrozoan jellyfish, or hydromedusa cnidarian. Hydromedusan jellyfish differ from scyphozoan jellyfish because they have a muscular, shelf-like structure called a velum on the ventral surface, attached to the bell margin.
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