Fossilized nautilus shell Nautilus striatus from the lower Jurassic period to my found in Lyme Regis Nautilus a Cephalopod is represented today by one family found in the IndoPacific region The shell is spirally coiled divided by transverse septa covered with calcite crystals here into numerous gasfilled chambers which maintain the animals buoyancy The living animal occupies the most recently formed chamber The enclosure of gas is through the siphuncle or shelly tube visible at centre which connects the gasfilled chambers with the animal In newly formed chambers water is pumped out by the siphuncle Locomotion is by water jets
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Product ID: 22107931689A