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They are sometimes collected as curios, used in design or as logos, and in some cultures, despite possible toxicity, they are eaten.The body wall consists of a thin cuticle, an epidermis consisting of a single layer of cells, a thick dermis formed of connective tissue and a thin coelomic myoepithelial layer, which provides the longitudinal and circular musculature.Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown.Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface.The dermis contains an endoskeleton of calcium carbonate components known as ossicles.These are honeycombed structures composed of calcite microcrystals arranged in a lattice.They remove debris from the body surface and wave around on flexible stalks in response to physical or chemical stimuli while continually making biting movements. Paxillae are umbrella-like structures found on starfish that live buried in sediment.The edges of adjacent paxillae meet to form a false cuticle with a water cavity beneath in which the madreporite and delicate gill structures are protected.

The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.

Some are thought to assist in defence, while others aid in feeding or in the removal of organisms attempting to settle on the starfish's surface.

The structures are supported by collagen fibres set at right angles to each other and arranged in a three-dimensional web with the ossicles and papulae in the interstices.

This arrangement enables both easy flexion of the arms by the starfish and the rapid onset of stiffness and rigidity required for actions performed under stress.

The water vascular system of the starfish is a hydraulic system made up of a network of fluid-filled canals and is concerned with locomotion, adhesion, food manipulation and gas exchange.

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