Section through a nautilus shell

Section through a nautilus shell

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Caption: Nautilus shell. A section through the shell of a Nautilus (Nautilus sp.). The nautilus has been removed allowing the the inner chambers and spiral whorls to be seen. At each shell partition is a knob-like structure forming the siphuncle tube. This thin internal tube (best seen top centre) is used for fluid transfer to regulate buoyancy. Because of this it is sometimes called a chamber snail. As the animal grows, new chambers are added one at a time to its shell. The Nautilus is a cephalopod mollusc resembling a squid in having many tentacles surrounding its mouth. Photographed under coloured lights.

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Keywords: animal, cephalopod, invertebrates, mollusca, nature, nautilus, nautilus shell, shell, spiral form, wildlife, zoology

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