Definitions for chambered nautilus
cham·bered nau·tilus

Princeton's WordNetRate this definition:0.0 / 0 votes

1. chambered nautilus, pearly nautilus, nautilusnoun

   cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions

WiktionaryRate this definition:0.0 / 0 votes

1. chambered nautilusnoun

   A marine mollusc, of the family Argonautidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers.

2. Etymology: Latin, from Greek nautilos (nautilus, sailor).

WikipediaRate this definition:0.0 / 0 votes

1. Chambered nautilus

   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 is to help avoid predators, because when seen from above, it blends in with the darkness of the sea, and when seen from below, it blends in with the light coming from above. The range of the chambered nautilus encompasses much of the south Pacific; It has been found near reefs and on the seafloor off of the coasts of Australia, Japan, and Micronesia.The eyes of the chambered nautilus, like those of all Nautilus species, are more primitive than those of most other cephalopods; the eye has no lens and thus is comparable to a pinhole camera. The species has about 90 cirri (referred to as "tentacles", see Nautilus § Cirri) that do not have suckers, differing significantly from the limbs of coleoids. Chambered nautiluses, again like all members of the genus, have a pair of rhinophores located near each eye which detect chemicals, and use olfaction and chemotaxis to find their food.The oldest fossils of the species are known from Early Pleistocene sediments deposited off the coast of Luzon in the Philippines. Although once thought to be a living fossil, the chambered nautilus is now considered taxonomically very different from ancient ammonites, and the recent fossil record surrounding the species shows more genetic diversity among nautiluses now than has been found since the extinction of the dinosaurs. Indeed, the taxon of the chambered nautilus, Nautilus pompilius is actually a grouping of tens of different species of nautilus under one name.All nautilus species are threatened due to overfishing for their shell, which primarily is used for jewelry and other ornamental artifacts. In 2016, they were moved to CITES Appendix II, which restricts international trade, and later the chambered nautilus was recognized as a threatened species under the Endangered Species Act.

WikidataRate this definition:0.0 / 0 votes

1. Chambered nautilus

   The chambered nautilus, Nautilus pompilius, 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 is to help avoid predators, because when seen from above, it blends in with the darkness of the sea, and when seen from below, it blends in with the light coming from above. The chambered nautilus has more primitive eyes than some other cephalopods; the eye has no lens and thus is comparable to a pinhole camera. The species has about 90 tentacles with no suckers, which is also different from other cephalopods. Chambered nautiluses have a pair of rhinophores, which detect chemicals, and use olfaction and chemotaxis to find their food. The oldest fossils of the species are known from Early Pleistocene sediments deposited off the coast of Luzon in the Philippines. Recently, scientists have become alarmed at declining populations of nautilus resulting from overfishing, and are studying world populations to determine the need for protection under the United Nations Convention on International Trade in Endangered Species.

Matched Categories

1. • Cephalopod

How to pronounce chambered nautilus?

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Numerology

1. Chaldean Numerology

   The numerical value of chambered nautilus in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of chambered nautilus in Pythagorean Numerology is: 5

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=chambered nautilus
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Chambered_Nautilus
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Chambered_Nautilus
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=chambered nautilus