There is no larval stage in the cephalopoda life cycle because the adults are mobile, and the whole purpose of the larvae stage is to move the young away from the adults for creatures that are immobile.
(the adults; are; mobile) (the whole purpose of the larvae stage; is; to move the young away from the adults for creatures) (creatures; are; immobile)
the adults the whole purpose of the larvae stage creatures
are is are
mobile
to move the young away from the adults for creatures
immobile