Coat (mollusc)

See also: Coat

The coat of the Mollusque S is an envelope of Peau which shelters the other bodies; it secretes the Coquille at the species which are equipped with it.

Between the coat and the visceral mass, the Bourrelet palléal constitutes a Cavité palléale which protects the respiratory bodies, and where the métanéphridies (bodies excréteurs) emerge, genital intestine and conduits.

At the cephalopods, the coat recovers the whole body and forms a fold which limits the cavity branchiale (the nautiloïdes are tétrabranchiaux and the coléoïdes are dibranchiaux). This skin is entirely covered with coloured bodies, the Chromatophore S, which, stimulated by the Cerveau, make it possible the cephalopods to very quickly change color. Above the pigmented cells exist iridescent cells reflecting the light.

Mould (mollusc)

At the aplacophore S, molluscs of small size, vermiform and deprived of shell, the coat secretes small spicules which could be the outline of a shell well.

At the polyplacophores, the dorsal hull is made of eight plates limestones articulated surrounded by a belt also secreted by the coat. On the level of the belt, the palléaux fabrics also secrete chitinous spicules limestones, scales limestones or silks (even three).

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