nautilus
Spiral-shelled mollusk
A nautilus is a marine mollusk with a spiral chambered shell, found in the Pacific and Indian Oceans.
The animal lives in the outermost chamber and uses the inner chambers for buoyancy.
The shell's elegant spiral has made it a symbol of mathematical beauty and natural design: The nautilus shell demonstrates the golden ratio. (Capitalized Nautilus refers to submarines or spacecraft.)
Tentacled marine mollusk class
- tentaclesFlexible grasping appendages
- shellHard outer covering
- chamberedHaving enclosed compartments
- mantleCovering or wrap
beak · radula · camouflage · buoyancy · pearl · calcification · septum · soft-bodied
Extinct spiral-shelled cephalopod
- paleontologyStudy of ancient organisms
- CretaceousFinal Mesozoic period
- JurassicDinosaur-dominated geological period
- TriassicFirst Mesozoic period
Mesozoic · petrified · extinct · stratigraphy · sedimentary · prehistoric · fossilization · geology
Curve winding around center
- logarithmicBased on exponents
- FibonacciPisan mathematician, numeral importer
- whorlSpiral arrangement of ridges
- coilWound circular arrangement
helix · curve · volute · geometry · symmetry · spire · convolution · mathematical
cephalopod
Tentacled marine mollusk class
mantle · beak · radula · camouflage · buoyancy · pearl · calcification · septum · soft-bodied · invertebrate
ammonite
Extinct spiral-shelled cephalopod
- paleontologyStudy of ancient organisms
- CretaceousFinal Mesozoic period
- JurassicDinosaur-dominated geological period
Triassic · Mesozoic · petrified · extinct · stratigraphy · sedimentary · prehistoric · fossilization · geology · antiquity
spiral
Curve winding around center
- logarithmicBased on exponents
- FibonacciPisan mathematician, numeral importer
- whorlSpiral arrangement of ridges
coil · helix · curve · volute · geometry · symmetry · spire · convolution · mathematical · fractal
- nautilus shellChambered cephalopod's outer covering
- chambered nautilusSpiral-shelled ocean mollusk
- USS NautilusFirst nuclear-powered submarine