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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 ...
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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 December 2024. Species of small, biologically immortal jellyfish Immortal jellyfish Turritopsis dohrnii medusa Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Cnidaria Class: Hydrozoa Order: Anthoathecata Family: Oceaniidae Genus: Turritopsis Species: T. dohrnii Binomial name ...
Staurozoa is a class of Medusozoa (or jellyfish).It has one extant order: Stauromedusae (stalked jellyfishes) with a total of 50 known species. A fossil group called Conulariida has been proposed as a second order, [3] although this is highly speculative.
Incredibly well-preserved fossils of the oldest swimming jellyfish, which lived 505 million years ago, ... Cnidarians can have different body forms within their life cycle, including a polyp ...
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]
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.