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.
This profile of starfish includes information on what starfish look like, how they are classified, how they feed, reproduce and about their unique vascular system, all organized with easy-to-navigate section headings.More Â». Sea star (starfish). Arrows point to red eye spots, located at the end of the arms.his profile of starfish includes information on what starfish look like, how they are classified, how they feed, reproduce and about their unique vascular system, all organized with easy-to-navigate section headings. More Â».