page_title: Siphon (mollusc)
hierarchical_section_title: Siphon (mollusc)
caption_attribution_description: A snail in the genus Nassarius, likely Nassarius tiarula, crawling on the sandy bottom at the north side of A-tier in Monterey Harbor. The long siphon probes are in front of the foot and cephalic tentacles.
context_page_description: A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda.
  Siphons in molluscs are tube-like structures in which water flows. The water flow is used for one or more purposes such as locomotion, feeding, respiration, and reproduction. The siphon is part of the mantle of the mollusc, and the water flow is directed to the mantle cavity.
  A single siphon occurs in some gastropods. In those bivalves which have siphons, the siphons are paired. In cephalopods, there is a single siphon or funnel which is known as a hyponome.
context_section_description: A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives).
  Siphons in molluscs are tube-like structures in which water flows (or more rarely in which air flows). The water flow is used for one or more purposes such as locomotion, feeding, respiration, and reproduction. The siphon is part of the mantle of the mollusc, and the water flow is directed to (or from) the mantle cavity.
  A single siphon occurs in some gastropods. In those bivalves which have siphons, the siphons are paired. In cephalopods, there is a single siphon or funnel which is known as a hyponome.
caption: The sea snail Nassarius fossatus is a scavenger. Siphon on the left
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