Mollusks Mollusca

The three mineralized hard parts are the teeth of certain mollusks called chitons, the dentin component of vertebrate teeth, and the skeleton of the larvae of the sea urchin. They all possess very different material properties. Taxonomically they are also very different, with each being formed by organisms that belong to different phyla the Mollusca, the Chordata and the Echinodermata respectively. 

Corals animals of the Cnidaria phylum (formerly Coe-lenterata), with a calcareous skeleton. Sea anemones and jellyfishes are Cnidaria without skeletons Dentine also called ivory, the inner hard tissue of the tooth. The bulk of a tooth is made up of dentine Enamel the outer layer covering the tooth Frustule the siliceous shell or exoskeleton of a diatom. It is composed of two valves (epitheca and hypotheca), one overlapping the other, like a pill box and its cover Mollusks invertebrates having a soft unsegmented body usually enclosed in a shell. Mollusca mainly includes Bivalvia, Gastropoda, and Cephalopoda... 

The majority of biosynthetic work in the phylum Mollusca has focused on the nudibranchs, one of the larger orders of Ophistobranch mollusks. The diet of nudibranchs includes sponges and tunicates and thus the biosynthetic origin of compounds isolated from these organisms must be established through experimentation. 

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