Mantle (mollusc)

The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusk's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually part of the feeding structure. In some mollusks the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ. The mantle is highly muscular. In cephalopods the contraction of the mantle is used to force water through a tubular siphon, the hyponome, and this propels the animal very rapidly through the water. In gastropods it is used as a kind of "foot" for locomotion over the surface. In Patella the foot includes the entire ventral surface of the animal. The foot of the Bivalvia is a fleshy process adapted by its form to digging rather than to locomotion. == Formation of mollusc shell ==

In shelled molluscs, the mantle is the organ that forms the shell, and adds to the shell to increase its size and strength as the animal grows. Shell material is secreted by the ectodermic (epithelial) cells of the mantle tissue. ==Mantle of gastropods==

The mantle of many gastropods is usually fully or partially hidden inside the gastropod shell. File:Cypraea chinensis with partially extended mantle.jpg|The marine gastropod Cypraea chinensis, the Chinese cowry, showing its partially extended mantle. File:Cypraea chinensis with fully extended mantle.jpg|Cypraea chinensis with its mantle fully extended. File:SnailWynaad.jpg|The mantle of the land snail Indrella ampulla is off-white in color and partly visible under the shell. The head and foot are red, and the foot fringe is off-white with narrow black lines. File:BEP 7909-1.jpg|The mantle of the nudibranch Felimida purpurea has a marginal line of orange-yellow colour. In species where the shell is small compared to the size of the body, more of the mantle shows. Shell-less slugs have the mantle fully visible. The dorsal surface of the mantle is called the notum, while the ventral surface of the mantle is called the hyponotum. In the family Philomycidae, the mantle covers the whole back side of the body. File:Bielzia coerulans-3.jpg|The mantle and the head of this slug Bielzia coerulans is smooth, while the rest of the body is tubercled. File:Megapallifera mutabilis.jpg|Megapallifera mutabilis from Philomycidae shows enormously developed mantle == See also ==