Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The tough horny or fibrous outer covering of the shell of many mollusks and brachiopods.
from The Century Dictionary.
- noun The horny epidermal investment of the shells of most mollusks.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) A chitinous membrane covering the exterior of many shells; -- called also
epidermis .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun malacology The proteinaceous outer sheath of many molluscan shells.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The researchers compare it to the thin protein coating, called the periostracum, seen on the shells of other snail species.
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The researchers compare it to the thin protein coating, called the periostracum, seen on the shells of other snail species.
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The researchers compare it to the thin protein coating, called the periostracum, seen on the shells of other snail species.
British Blogs 2010
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The researchers compare it to the thin protein coating, called the periostracum, seen on the shells of other snail species.
Discover Blogs 2010
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[2] This shell has an outer tissue-like layer called the periostracum that changes color as the bicuspid grows.
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[2] This shell has an outer tissue-like layer called the periostracum that changes color as the bicuspid grows.
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Is their periostracum sticky or is the snails' mucus somehow involved in the process?
Gastrocopta contracta AYDIN 2008
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However, one problem with ink is that it isn't absorbed into the periostracum but stays on it and, sooner or later, even the most "permanent" ink flakes off.
Archive 2008-08-01 AYDIN 2008
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However, one problem with ink is that it isn't absorbed into the periostracum but stays on it and, sooner or later, even the most "permanent" ink flakes off.
How to mark a snail shell AYDIN 2008
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Gastrocopta that I've run across are often in more xeric habitats - perhaps there's a combination of fluctuating moisture in the soil and the snail's ecology some are burrowers that tends to get soil stuck to the periostracum.
Gastrocopta contracta AYDIN 2008
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