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You asked:

is the cuttlefish a vertebrate

No. A cuttlefish is not a vertebrate.
cuttlefish
cuttlefish
cuttlefish

Cuttlefish, marine animals of the order Sepiida belonging to the Cephalopoda class

vertebrate
vertebrate
vertebrate

Vertebrate (Vertebrates, members of the subphylum Vertebrata, chordates with backbones or spinal columns)