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زیست شناسی::
مدوزا
These organisms have both a polyp stage (similar to the hydra) and a medusa ("jellyfish") stage in their life cycle.
In most hydrozoan species, the polyp stage gives rise the sexual medusa stage.
The medusae then produce gametes that spawn the next generation
However, the medusae of T. dohrnti and H. carnca can revert to the polyp stage after becoming sexually mature (Bavestrello et a). 1992; Piraino et al, 1996), a feat called reverse development (Schmich et al. 2007).
The multilayered medusa essentially dedifferentiates to become a two-layered ball-like stage similar to that of a larva before becoming a polyp, and then develops into a polyp itself (FIGURE 23.9).
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