Each osteoderm possesses a pronounced central keel and an anterior projection.

It is relatively flat, although it has a central keel in its basal part.

The chosen design was the "Power Tower", a long central keel with most mass located at either end.

The yellow-blotched map turtle has the highest central keel of all map turtles.

The central keel is beige in colour.

Originally centered directly along the central keel, now it was a wobbly, off-kilter eccentric spin.

The six missiles under the central keel were not affected by the command; only the two missiles that Marty had manually armed responded.

The lip bears two tooth-like processes on either side of the column, and a central keel.

Hatchlings have a central keel which disappears with age.