Periostracum

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The periostracum is a thin organic coating forming the outer-most layer of the shell of many mollusks. The periostracum "is composed of a type of conchin [or conchiolin] (largely quinone-tanned proteins) similar to that found in the epidermal cuticle."[1]

[edit] References

  1. ^ Brusca, R.C. & G.J. Brusca 1990. Invertebrates. Sinauer Assoc., Inc, Sunderland, Massachusetts. p. 716.
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