The Chambere Nautilus (Nautilus pompilius) is the best known species of nautilus. The shell, when cut away as in the photograph below, reveals a lining of lustrous nacre, and displays a nearly perfect equiangular spiral. It has primitive eyes compared to other cephalopods, mostly because they have no lens. Their eyes are comparable to a pinhole camera. It has about 90 tentacles and no suckers which is also different from other cephalopods. This nocturnal animal has a pair of rhinophores, which detect chemicals and uses olfaction and chemotaxis to find its food.