Richard E. Strassberg earned his Ph.D. in East Asian Studies from Princeton University.
Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.bout 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface.
The sawfish is an endangered fish that belongs to a group of fish called elasmobranchs, whose skeletons are made of cartilage. Other elasmobranchs include sharks, skates, rays, and chimeras. Sawfish have a shark-like body and gills on their top side. They are known primarily for their long, toothed nose or âsawâ called a rostrum. Sawfish use their rostrum to locate, stun, and kill prey.