air vesicle

It is rare on exposed shores where any specimens may be short, stunted and without the air vesicles.

Numerous small 2-6 mm stalked air vesicles provide buoyancy.

There are air vesicles, called atria, which project radially from the walls of the parabronchi.

Under the microscope they prove to be nearly completely glassy with small circular air vesicles sometimes drawn out to long tubes.

The aerocyst or air vesicles keep the organism erect, by causing it to float in strong currents.

Readily identified by a distinct mid-rib and air vesicles in pairs on either side of the mid-rib.

They have catenate pnuematocysts (air vesicles).

It does not have air vesicles, such as are found in F. vesiculosus, nor is it spirally twisted like F. spiralis.