They were connected to the shell by intricate lines known as sutures—the complexity of which varied tremendously throughout this animal’s evolution. The many chambers of their shells likely ...

These pore-pairs are situated along the outer (adambulacral) margins of the ambulacral zone. The central suture line between the two columns of plates in each ambulacral zone is the perradial suture ...

The lung is deflated and retracted upward. Any adhesions found are freed. The weakened area of the diaphragm is then grasped with a clamp and elevated to determine the location of suture line. Layers ...