Siphuncle

Definition

In cephalopods, a tubular structure that runs through the shell chambers, used for buoyancy control.

Etymology

From Latin 'siphunculus', meaning 'little pipe' or 'tube'.

Example

The siphuncle of the nautilus allows it to control its buoyancy by regulating gas and liquid within its shell chambers.

Related Terms

• Cephalopods
• Buoyancy
• Nautilus

Usage Notes

The siphuncle is a critical anatomical feature in chambered cephalopods for precise buoyancy control.