Echinoderms

What does the term echinoderm mean?

• tube feet
• star shaped
• spiny skin
• stomach foot

What type of symmetry do adult echinoderms exhibit?

• Asymmetry
• Pentaradial symmetry
• Bilateral symmetry
• Trilateral symmetry

Sea stars feed by

• Injecting poison that digests the prey 
• Everting their stomach to digest prey
• Chewing their prey with jaws and teeth
• squeezing their prey until it dies

What type of skeleton do echinoderms have?

• Exoskeleton
• Hydrostatic skeleton
• Endoskeleton
• Mesenteric skeleton

Which of the following organisms is NOT an echinoderm?

• sea cucumber
• sand dollar
• nudibranch
• brittle starfish

These structures resemble long suction cups, and are part of the water vascular system.

• madreporite

• radial canals

• tube feet

• ampullae

Appendages of the central disk are referred to as

• Arms

• Rays

• Fingers

• Hands

Echinoderms have an internal skeleton and a system of fluid-filled tubes called a(n)...

• water vascular system
• nervous system
• notochord
• ampulla

What are these?

• Mouth
• Anus
• Madreporite
• Tube foot

Echinoderms have no head or brain.

• True

• False