Phylum Echinodermata Quiz

1. Water enters the sea star through this hole on the aboral side.
7. Echinoderms use these to "walk".
9. Echinoderms have this type of vascular system which enables them to move, respirate, and circulate fluids in their bodies.
11. Brittle and basket stars are in this class.
14. Sea urchins and sand dollars are part of this class.
15. Sea cucumbers are included in this class.
17. The carbonate plates that form the echinoderm's endoskeleton are called this.
19. The side of the echionoderm opposite of the mouth.
22. Gametes (eggs and sperm cells) used in sexual reproduction are made in these organs.
24. This means "spiny skinned" in Latin.
26. Sea cucumbers and pearl fish share this type of symbiotic relationship, where both benefit from living together.
27. Sea Star ________ Syndrome is a disease that wiped out 95% of the sunflower sea stars along the Pacific coast. The cause of the disease is unknown.

2. Another name for an echinoderm's arm.
3. Echinoderms have the ability to re-grow missing body parts, which is called this.
4. Instead of a brain, echinoderms have this network of interlacing nerves that lie under the echinoderms' skin.
5. These nerves extend from the nerve ring laterally inside each ray's abulacral groove.
6. This stomach is used for digestion and stays inside the body.
8. Echinoderms have this body symmetry.
10. The main prey of sea stars are these two-shelled creatures, although they may also scavenge on larger, dead animals, or other echinoderms.
12. Sea urchins are ____________, which means they only eat plants/algae.
13. Sea Lilies and feather stars are in this class.
16. Sea stars are in this class.
18. These grooves radiate out along the arms from the mouth and contain the tube feet.
20. This canal transports water from the madreporite to the ring canal.
21. The side of the echinoderm with the mouth.
23. These small bulb-like structures push and pull water into the tube feet creating water pressure changes that allow the echinoderm to move (hydralics).
25. This stomach is extended outside the body through the mouth to engulf and digest prey.