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==Classes== In the class [[Anthozoa]], comprising the [[sea anemones]] and [[coral]]s, the individual is always a polyp; in the class [[Hydrozoa]], however, the individual may be either a polyp or a [[medusa (biology)|medusa]],<ref name=EB1911>{{EB1911 |wstitle=Polyp |volume=22 |page=37 |first=Edward Alfred |last=Minchin |inline=1}}</ref> with most species undergoing a [[biological life cycle|life cycle]] with both a polyp stage and a medusa stage. In the class [[Scyphozoa]], the medusa stage is dominant, and the polyp stage may or may not be present, depending on the [[family (biology)|family]]. In those scyphozoans that have the [[larval]] planula [[metamorphose]] into a polyp, the polyp, also called a "[[scyphistoma]]," grows until it develops a stack of plate-like medusae that pinch off and swim away in a process known as [[strobilation]]. Once strobilation is complete, the polyp may die, or [[regeneration (biology)|regenerate]] itself to repeat the process again later. With [[cubozoa]]ns, the [[planula]] settles onto a suitable surface, and develops into a polyp. The cubozoan polyp then eventually metamorphoses directly into a medusa.{{Citation needed|date=January 2025}}
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