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Definition of Genus spirula
1. Noun. Genus of small cephalopods with many-chambered spiral shells resembling those of the extinct belemnites.
Generic synonyms: Mollusk Genus
Group relationships: Family Spirulidae, Spirulidae
Member holonyms: Spirula, Spirula Peronii
Group relationships: Family Spirulidae, Spirulidae
Member holonyms: Spirula, Spirula Peronii