Hydrozoa
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Noun 1. [画像:Hydrozoa - coelenterates typically having alternation of generations]Hydrozoa - coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata - hydras; polyps; jellyfishes; sea anemones; corals
genus Hydra - hydras
order Siphonophora, Siphonophora - marine colonial hydrozoans
genus Sertularia, Sertularia - sessile hydroid that forms feathery colonies
class - (biology) a taxonomic group containing one or more orders
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