What is metagenesis? What are the other names of this process?

What is metagenesis? What are the other names of this process?
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Metagenesis is the type of life cycle in which there are two different forms of individuals of the same species, one haploid and the other diploid. In one of these stages gametogenesis occurs and fecundated gametes give birth to the zygote that then develops into the other form. Metagenesis is also known as alternation of generations or as diplobiont life cycle. (All plants, for example, present metagenesis.)
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In the metagenesis of Aurelia and Obelia what is the form that produces gametes? What is the form that reproduces asexually?

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