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Definition of Belemnoidea
1. Noun. Order of extinct dibranchiate cephalopods related to the surviving spirulas.
Exact synonyms: Order Belemnoidea
Generic synonyms: Animal Order
Group relationships: Dibranchia, Dibranchiata, Subclass Dibranchia, Subclass Dibranchiata
Member holonyms: Belemnitidae, Family Belemnitidae
Generic synonyms: Animal Order
Group relationships: Dibranchia, Dibranchiata, Subclass Dibranchia, Subclass Dibranchiata
Member holonyms: Belemnitidae, Family Belemnitidae