the octopus is considered the smartest of ALL invertebrates
A cephalopod is a snail.
A cephalopod is a mollusk and an invertebrate; it has no skeleton neither external nor internal.
Yes they are
A octopus is a cephalopod that has no shell. Also squid have internal shells that are not used for protection.
Cephalopod
bilateral symmetry
A cephalopod.
the superlative of smart is smartest
The only extant cephalopod that produces an external shell is the chambered nautilus. The shells produced by squid and cuttlefish are internal.
calamari
cephalopod
Mesonychoteuthis hamiltoni