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en.m.wikipedia.org/wiki/Cuttlebone Mobile-friendly - Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, a family within the cephalopods. Cuttlebone is composed primarily of aragonite.
Spotted on Jan 19, 2015
Submitted on Jan 19, 2015
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