Metasepia tullbergi

giant cuttlefish. This reclassification renders the genus Metasepia obsolete^[4]

dorsal surface of the cuttlebone and tapers into a sharp point on the dorsal corner.^[5] The anterior surface of the cuttlebone is entirely covered in chitin; the posterior surface is calcareous. The paintpot cuttlefish's chromatophores are mostly set to be darkly colored with bright yellow spots on the head, dorsal side of mantle, and arms. The protective membranes on the arms are red.^[6]

flamboyant cuttlefish.^{[citation needed}

copulation during which they insert their hectocotylus into a female’s mantle cavity and fertilize the eggs. Egg masses are laid in rocky areas at around 20 meters deep and hatch during the summer. Freshly hatched cuttlefish, which resemble miniature adults, migrate to 80 meters depth in sandy-mud areas from August to September to grow and develop, after which the mature squid moves towards the shallows to spawn. This migration occurs in March. Embryos hatch and live as plankton in the water column for several weeks before becoming benthic adults.^{[5] [contradictory}

neuronal activity may propagate through the body. One phenomenon that many cephalopods share is the ability for their skin to change colors due to the presence of chromatophores on their skin. The change of color is activated by an action potential traveling through the cephalopod skin. Because all neural activity in biological systems are controlled by the propagation of action potentials, neuroscientists are especially interested in this visual representation of action potential propagation. Cuttlefish have a mode of color change typified by dark bands traveling across the animal’s body in a coordinated pattern called “passing clouds”.^[8] The paintpot cuttlefish is especially conducive to this kind of research due to their small size, slow speed and the frequency of the passing clouds display. The results of this study concluded that the passing clouds phenomenon was a result of central wave generation indicating that the action potential originated at a single point controller. This may indicate that cephalopods may have a central nervous system similar to humans which can lead to larger implications in neuroscience.^[9][8]