Definitions for phragmacone
phrag·ma·cone

Princeton's WordNetRate this definition:0.0 / 0 votes

1. phragmocone, phragmaconenoun

   the thin conical chambered internal shell (either straight or curved) of a belemnite

WikipediaRate this definition:0.0 / 0 votes

1. phragmacone

   The phragmocone is the chambered portion of the shell of a cephalopod. It is divided by septa into camerae. In most nautiloids and ammonoids, the phragmocone is a long, straight, curved, or coiled structure, in which the camarae are linked by a siphuncle which determines buoyancy by means of gas exchange. Despite this benefit, such a large shell adds to the mass of the animal, and hence is disadvantageous in catching fast-moving prey. Some nautiloids, such as the Silurian Ascocerida, dropped the phragmocone upon maturity, presumably to increase speed and maneuverability. They thus became the early Paleozoic equivalent of coleoids. The early coleoids and belemnoids adopted a different approach: the phragmocone was retained but became internal and reduced. In general the shell in cephalopods tends to be vestigial or absent.

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1. phragmacone

   A phragmacone is the chambered part of the shell of an extinct cephalopod, typically a nautilus or ammonite. These chambers were filled with gas or fluid, allowing the creature to control its buoyancy and movement in the water. The phragmacone is often fossilized, and the characteristic pattern of chambers and connecting tubes (siphuncles) can be used for identification.

Matched Categories

1. • Shell

Usage in printed sourcesFrom: 

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How to pronounce phragmacone?

1. Alex

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How to say phragmacone in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of phragmacone in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of phragmacone in Pythagorean Numerology is: 2

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=phragmacone
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Phragmacone
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=phragmacone