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nautilus
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nautilus

Sea animal related to octopuses and squids, with many short, grasping tentacles surrounding a sharp beak, but different in that it has an outer shell. It is a cephalopod, a type of mollusc, and is found in the Indian and Pacific oceans. The well-known pearly nautilus (N. pompilius) has a chambered spiral shell about 20 cm/8 in in diameter. Its body occupies the outer chamber. (Genus Nautilus, class Cephalopoda.)

Nautiluses detect their prey by smell, using rhinopores, paired openings just below the eyes, according to US researchers in April 2000. Paper nautilus is another name for the argonaut, a type of octopus.

The living nautiluses are representatives of a group common 450 million years ago.

Nautilus

The name of the world's first nuclear-powered submarine, launched by the USA in 1954; it sailed under the icecap to the North Pole.



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? Mentioned in ? References in periodicals archive
 
The deepest layer contains traces of seafloor burrows and large numbers of phosphate nodules that include the fossils of ammonites, the extinct relatives of today's chambered nautilus.
Fossils found under tons of Kitty Litter. (Paleontology) by Science News
The Expo 2000 Pavilion was designed as three overlapping chambers, shaped like a chambered nautilus seashell--one of the most fascinating geometric shapes in nature.
Delivering the messages: The UN works for you! by Hack, Nadine B. / UN Chronicle
Relatives of the chambered nautilus, ammonites filled the seas during the Mesozoic era, the age of the dinosaurs.
A Forrest Gump of the dinosaur era by Monastersky, Richard / Science News
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