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The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This ...
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Nautilus half-shell showing the camerae in a logarithmic spiral Section cut of a nautilus shell A nautilus shell viewed from above (left), and from underneath (right) Nautili are the sole living cephalopods whose bony body structure is externalized as a planispiral shell .
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells.
English: Diagram of the anatomy of an adult female Nautilus pompilius depicting the digestive, reproductive, and some of the circulatory, nervous, and muscular systems. Français : Diagramme de l'anatomie d'une femme adulte Nautilus pompilius représentant les systèmes digestif, reproducteur et certains des systèmes sanguin, nerveux et ...
It is sometimes erroneously stated that spiral galaxies and nautilus shells get wider in the pattern of a golden spiral, and hence are related to both φ and the Fibonacci series. [3] In truth, many mollusk shells including nautilus shells exhibit logarithmic spiral growth, but at a variety of angles usually distinctly different from that of ...
Get ready for all of the NYT 'Connections’ hints and answers for #176 on Monday, December 4, 2023. Connections game on Monday, December 4, 2023. The New York Times.
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