Quick answer
The chambered nautilus is a deep-water cephalopod that lives inside a coiled, chambered shell, often called a living fossil because its kind has changed little in hundreds of millions of years. Unlike its relatives the octopus and squid, it has dozens of simple tentacles, primitive pinhole eyes, and an external shell divided into gas-filled chambers that control buoyancy. Found on deep reef slopes of the Indo-Pacific, it grows slowly and can live more than 15 years.
Key takeaway
The chambered nautilus is a deep-water cephalopod that lives inside a coiled, chambered shell, often called a living fossil because its kind has changed little in hundreds of millions of years. Unlike its relatives the octopus and squid, it has dozens of simple tentacles, primitive pinhole eyes, and an external shell divided into gas-filled chambers that control buoyancy. Found on deep reef slopes of the Indo-Pacific, it grows slowly and can live more than 15 years.
Overview
The chambered nautilus is a deep-water cephalopod that lives inside a coiled, chambered shell, often called a living fossil because its kind has changed little in hundreds of millions of years. Unlike its relatives the octopus and squid, it has dozens of simple tentacles, primitive pinhole eyes, and an external shell divided into gas-filled chambers that control buoyancy. Found on deep reef slopes of the Indo-Pacific, it grows slowly and can live more than 15 years.
Biology
Chambered Nautilus (Nautilus pompilius) is classified as Invertebrate with conservation status Least Concern. Typical weight about 1.3 kg; lifespan around 15–20 years.
Ecology
Diet: Carnivore and scavenger (shrimp, crabs, carrion). Habitat: Deep reef slopes of the tropical Indo-Pacific. Movement and social systems reflect those pressures.
People and this species
Learn before you travel or keep related pets. Wild individuals are not toys; captive care needs species-specific husbandry.
Further reading
See the full Chambered Nautilus profile for FAQs, taxonomy, and related guides on this site.
A living fossil
Nautiluses belong to an ancient group of shelled cephalopods that flourished hundreds of millions of years ago, and modern species look much like their distant ancestors. This has earned them the nickname living fossils. Unlike octopuses and squid, they keep a hard external shell, making them the only living cephalopods to do so.
The chambered shell
The nautilus shell is divided into a series of sealed chambers, with the animal living only in the largest, outermost one. As it grows it builds new chambers and adjusts the mix of gas and liquid inside the older ones to control buoyancy, much like a submarine's ballast tanks. A tube called the siphuncle threads through the chambers to regulate this balance.
Tentacles and senses
A nautilus can have up to about 90 simple, sucker-less tentacles that it uses to grip food and surfaces. Its eyes are remarkably basic, working like a pinhole camera with no lens, so it relies heavily on smell to find food in the dark. It moves slowly by jet propulsion, drawing water into its body and expelling it through a flexible funnel.
Diet and conservation
Nautiluses are carnivores and scavengers that feed on shrimp, crabs, and the molted shells and remains of other animals, rising from deep water at night to forage. They grow slowly, mature late, and produce few eggs, which makes them vulnerable to overharvesting for their attractive shells. International trade is now regulated to protect wild populations.
Research notes
Figures for chambered nautiluss (Nautilus pompilius) come from field studies, museum records, and conservation assessments that do not always agree on exact averages. Prefer ranges over single-point claims, and check whether a source describes wild, captive, or mixed populations.
Practical takeaways
If you encounter chambered nautiluss in the wild, prioritise distance and local guidance. If you care for related domestic or captive animals, match diet and housing to species needs rather than generic pet advice. Share accurate status information (Least Concern) when discussing conservation.
Sources
FAQs
Chambered Nautilus: Key Facts & Natural History?
The chambered nautilus is a deep-water cephalopod that lives inside a coiled, chambered shell, often called a living fossil because its kind has changed little in hundreds of millions of years. Unlike its relatives the octopus and squid, it has dozens of simple tentacles, primitive pinhole eyes, and an external shell divided into gas-filled chambers that control buoyancy. Found on deep reef slopes of the Indo-Pacific, it grows slowly and can live more than 15 years.
What is the scientific name of the chambered nautilus?
Nautilus pompilius
What do chambered nautiluss eat?
Carnivore and scavenger (shrimp, crabs, carrion)
Where do chambered nautiluss live?
Deep reef slopes of the tropical Indo-Pacific
Are chambered nautiluss endangered?
Listed here as Least Concern. Check IUCN and national lists for the latest assessment.