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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 ...
Catostylidae jellyfish go through six stages in their life cycle. They go between both asexual (polypoid) and sexual (medusoid) generations. Their life cycle progresses from planula to scyphistoma to podocyst to strobila to ephyra, culminating finally in the medusa stage. [10] [4]
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]
Turritopsis dohrnii (Weismann, 1883) also known as the "Benjamin Button jellyfish", or the "immortal jellyfish". It can reverse its life cycle and transform itself back to a polyp. [3] Turritopsis fascicularis Fraser, 1943; Turritopsis lata Lendenfeld, 1884; Turritopsis minor (Nutting, 1905)
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.
With this, the first step to jellyfish reproduction is the male releasing sperm from its mouth into the water it occupies. The females swim through this water and the sperm enters her oral cavity to reach unprotected eggs. This leads to these eggs become fertilized and develop into larvae, which begins the life cycle of this species.
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