Eukaryote
Hydrozoa
Hy·dro·zo·a
Subclass of:
Cnidaria
Definitions related to hydrozoa:
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A class in the phylum CNIDARIA which alternates between polyp and medusa forms during their life cycle. There are over 2700 species in five orders.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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Class in the phylum Cnidaria which alternates between polyp and medusa forms during their life cycle; there are over 2700 species in five orders.CRISP ThesaurusNational Institutes of Health, 2006
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