PHYLUM: ___________________
CLASSES: 1. ______________ 2. _________________ 3. __________________
4. ______________ 5. ___________________
1. Move by using _________________ & a water vascular system. Water enters through the sieve plate or _______________________. The plate is located on the _________ of the starfish called the basal disc. Water leaves the plate & enters the _________________ then the _________________. It is then sent to the _____________________. These structures cover the lower side of the arms & have suckers & are used to walk across the ocean floor.
2. All are ________________.
3. The endoskeleton has _______________ spines (external) & individual plates called _______________ (provide muscle attachment).
4. __________________ sexes.
5. Free swimming _______________.
6. Reproduce by ________________________ or ________________ fertilization.
7. _____________________ symmetry in adults (pentamerous). ____________ symmetry in larvae.
8. All systems are present. Mouth located normally _____________________ the body. Feed by turning _______________ inside out, entering the prey, and secreting digestive enzymes.
9. True body cavity - _____________________.
10. Each arm possesses ________________ & ___________________ glands.
11. No head or brain. Nervous system consists of central ring of nerves with branches extending into the arms.
12. Respiration & waste removal performed by ____________________.
CLASS CRINOIDEA – sea lilies (sessile) & feather stars – mouth on upper side
CLASS ASTEROIDEA – starfish – predators in marine ecosystems
CLASS OPHIUROIDEA – brittle stars (like slender starfish)
CLASS ECHNOIDEA – sand dollars & sea urchins (no arms) – hard endoskeletons
CLASS HOLOTHUROIDEA – sea cucumbers – soft bodies