Starfish commonly have a spiny skin with tiny bone-like plates. On the surface of the dorsal view of a starfish arm, there are tiny arms with pincers called ‘pedicellaria’. These act in cleaning off debris and they also work with the spines that are sticking out to keep most predators at bay.
Starfish arms have tube feet on the ventral face, which belong to a hydraulic water vascular system. This system aids the starfish in movement and feeding.
Star Fish Arm Dorsal View
Star Fish Arm Ventral