Many members of this class possess a bone-like structure called a gladius.
Some members of this class detach their sperm-carrying arms and leave them attached to females. Many members of this class possess a bone-like structure called a gladius. Some representatives of this class have long strands of tissue called siphuncles. Vampyroteuthis infernalis is a member of one of the only two extant subclasses of this class, Coleoidea. Their penises are called (*) hectocotyli and the nerve fibers of most members of this class exhibit little to no myelination and large diameters, leading those fibers to be used as medical study aids. Other members of this class include the extinct ammonites and the shelled nautiloids. For 10 points, name this class of intelligent mollusks that have their own jet-propulsion systems, which includes squids and octopi.
Some members of this class detach their sperm-carrying arms and leave them attached to females.
Cephalopoda