The chambered nautilus gets its name from the fact that it builds its shells in sections, or "chambers", as it grows. It is the only modern species of nautilus that appears in either of the Endless Ocean games.
“These creatures have helical shells with dozens of protruding tentacles. The shell is white with radial marks of reddish brown. They appear at night in a secret location.
They propel themselves along by expelling water through funnel-shaped feelers. Their eyes, however, are small pinholes that lack a crystalline lens--which means their vision is very poor.
Their shells contain a section for the main body, as well as numerous smaller areas that are connected by narrow ducts. These secondary chambers are filled with low-pressure gasses and liquids that they use to adjust their buoyancy. The genus name Nautilus means “sailor” and was also the name of the world’s first submarine.”
"Its spiral shell has a radial pattern of red-tinted brown lines. It has so-called pinhole eyes, which have no lens and leave it with poor eyesight. Its ancestors lived about five hundred million years ago, when ammonites and other large species thrived. However, their numbers fell due to subsequent climate change, natural selection, and other factors, and only the Nautilidae family survived to the present day."
- In the Abyss, a couple can be found in front of the entrance to the Fiend's Cave, only at night.
- In the Underwater Ruins of Mo'ia Atoll, another group can be found in a small tunnel connected to the exterior maze, swimming in front of a stone tablet at G-5, and also only at night.
These small creatures float around slowly and aimlessly. They like being fed.
- After the player has beaten the game and collected the set of Constellation Coins necessary to complete the Voice of the Night Sky sub-quest Signs of the Zodiac, the only other nautiloid creature in either of the Endless Ocean games appears in the Zahhab Region. However, due to its nature, it does not appear as a silhouette in the Marine Encyclopedia before it is encountered.
- Like both games report, the chambered nautilus does not have very good eyesight due to its "pinhole" eyes that lack a cornea or lens. Though the chambered nautilus has the most highly-developed version of this kind of eye in the animal kingdom,It is only really able to tell the difference between light and dark.
- The chambered nautilus gets its name because it builds its shell into distinct "chambers" as it grows. These chambers are filled with gasses and liquids that help the nautilus maintain its buoyancy (float up or down when it wants) and stay upright in the water. They are connected by specialized tubes called "siphuncles" (the "ducts" mentioned in the first game's description).
- The mechanism by which the chambered nautilus controls its own buoyancy inspired the inventor of the first modern submarine to name it the "Nautilus".
- Like the second game says, the ancestors of the modern nautilus lived about 500 million years ago. The modern family Nautilidae is the only representative of the Nautiloidea, or nautiloids, that has lived until today. However, humans pose a threat to the nautilus' current existence, as its shell is very sought-after for decoration and fashion.
- Chambered nautiluses live for a very long time when compared to other cephalopods (squids, octopi, cuttlefish, and nautiloids) - about 20 years on average. Nautiluses are also the only cephalopod species to reproduce more than once, as the others others reproduce a single time and then die (which shortens their lifespan considerably).
- The chambered nautilus is also called the emperor nautilus or pearly nautilus.
- Sea and Sky
- Monterey Bay Aquarium
- Animal Diversity Web
- Australian Museum
- Nautilus Magazine
- Aquarium of the Pacific
- Encyclopaedia Britannica (Nautilus)
- US Fish and Wildlife Service
- New World Encyclopedia
- Center for Biological Diversity
- Animal Diversity Web (Genus Nautilus Classification)