The tubular organ through which water is ejected from the gill cavity of a cephaloid. It serves as a locomotive organ, by guiding and confining the jet of water. Called also siphuncle. See Illust. under Loligo, and Dibranchiata.

The siphuncle of a cephalopod shell.

A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.

a tubular organ of aquatic invertebrates, by which water is taken in or expelled.

a tubular organ, especially of arthropods and mollusks, by which water is taken in or expelled.

The inhalent and exhalent siphons of tridacnid clams are used to allow for gas exchange and to expel wastes. Also refers to the process of removing water from a tank with the aid of a hose and gravity.

The inhalant and exhalant siphons of tridacnid clams are used to allow for gas exchange and to expel wastes.

Opening in molluscs or in urochordates which draws water into the body cavity. In many molluscs, the siphon may be used to expel water forcibly, providing a means of propulsion.