siphuncle
invertebrate anatomy
Quick Summary
The siphuncle is a tubular extension of the mantle found in shelled cephalopods, such as the nautilus. It runs through the chambers of the shell and is involved in buoyancy control by regulating gas and fluid levels within these chambers. In some fossil cephalopods, an inner tube called the endosiphuncle is present within the calcareous siphuncle. The term "siphuncle" can also refer to a cornicle on an aphid.123
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