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BIOL212
Majors animal: External anatomy of the sea star (matching)
Structure | Function |
---|---|
Spines | Calcareous projections for protection and support |
Pedicellariae | Pincerlike structures believed to kill small organisms that may settle on body surfaces, thus keeping the epidermis free of parasites and algae |
Dermal branchiae | Gas exchange and excretion through simple diffusion |
Mouth | External opening to cardiac stomach (through a short esophagus) |
Anus | Regulates egestion of undigested food (feces) from the body |
Madreporite | Porous entrance to the water vascular system that serves as both pressure regulator and simple filter |
Ambulacral grooves | Radiate from the mouth to the tip of each arm and house the tube feet |
Tube feet | Locomotion and prey capture |