Ommastrephoidea is a superfamily of cephalopods. There are 26 species of Ommastrephoidea, in 11 genera and 1 family. It includes groups like Arrow Squids. Dead Ommastrephoidea formshallow marine sediments.
Definition: Relative to pinhole eyes, lens eyes have greatly improved resolution and image brightness. The lens converges incoming rays of light, thereby reducing the angle over which each photoreceptor receives light, and forming an image focused on the retina. Most lens eyes have "accommodation"; they can focus an image either by physically moving the lens toward or away from the retina or by using eye muscles to adjust the shape of the lens.