noun
- a small deep-sea cephalopod mollusk with a coiled internal shell
Usage: zoological
Examples
- The spirula is found in tropical and subtropical waters worldwide.
- Scientists study the spirula’s unique buoyancy control system.
- The spirula’s shell often washes up on beaches after the animal dies.
- Unlike other cephalopods, the spirula has a distinctive coiled internal shell.
- Marine biologists collected spirula specimens from deep ocean waters.
- The spirula uses its shell chambers to regulate its depth in the water column.