Also known as: オウムガイ, 鸚鵡貝, 鹦鹉螺
A Cephalopod characterized by involute or more or less convolute Mollusk Shells that are generally smooth, with compressed or depressed whorl sections, straight to sinuous sutures, and a tubular, generally central siphuncle.
Having survived relatively unchanged for hundreds of millions of years, nautiluses represent the only living members of the subclass nautiloidea, and are often considered "living fossils".
