1. Ch 38 – Echinoderms and Invertebrate Chordates
Vocabulary Review
Ch 38 –
Echinoderms and Invertebrate Chordates

2. A radially symmetrical marine invertebrate that has an endoskeleton, such as a starfish, a sea urchin, or a sea cucumber
Echinoderm

3. One of the small, calcium carbonate plates that make up the endoskeleton of an echinoderm
Ossicle

4. Water-vascular system
A system of canals filled with a watery fluid that circulates throughout the body of an echinoderm
Water-vascular system

5. One of many small, flexible, fluid-filled tubes that project from the body of an echinoderm and that are used in locomotion, feeding, gas exchange, and excretion
Tube foot

6. In some protists and invertebrates, a protective covering that the organism secretes or builds around itself
Test

7. On the surface of some echinoderms, very small pincers that are used for protection against ectoparasites
Pedicellaria

8. The porous structure through which water enters and exits the water-vascular system of echinoderms
Madreporite

9. A tube that connects the madreporite to the ring canal
Stone canal

10. Canal that encircles the mouth of an echinoderm
Ring canal

11. Canals that extend from the ring canal down each of the rays of the starfish, delivering water to ampullae and tube feet
Radial canal

12. On the upper end of a tube foot of an echinoderm, a bulblike sac that forces water into the tube foot and causes the tube foot to expand
Ampulla

13. Stomach of the sea star that can turn inside out through its mouth; transfers food to the pyloric stomach
Cardiac stomach

14. Stomach that connects to a pair of digestive glands in each arm
Pyloric stomach

15. Bilaterally symmetrical, free-swimming larva of a sea star
Bipinnaria

16. An opening from the atrial cavity to the exterior in certain fish
Atriopore