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|Noun||1.||genus Sertularia - sessile hydroid that forms feathery colonies|
coelenterate genus - a genus of coelenterates
class Hydrozoa, Hydrozoa - coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
sertularian - feathery colony of long-branched stems bearing stalkless paired polyps
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