Jellyfish: Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Jellyfish ...
Hydrozoa represent one of the most speciose and morphologically varied lineages within the phylum Cnidaria, encompassing solitary hydroids, colonial branching forms and free-swimming medusae.
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