The periostracum is a thin organic coating or "skin" which is the outermost layer of the shell of many mollusks, for example the shells of many bivalves or gastropods.

The periostracum is composed of a type of conchiolin (largely quinone-tanned proteins) similar to that found in the epidermal cuticle.


Search another word or see Periostracumon Dictionary | Thesaurus |Spanish
Copyright © 2015, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature