Phylum – Echinodermata
Instructions – read pages 636-644 in your textbook. Now answer the following questions to demonstrate
understanding of the material read.
1.) What does echinodermata mean? ___________________________________________________
2.) List four members that belong to this phylum:
a.) ____________________________
b.) ____________________________
c.) ____________________________
d.) ____________________________
3.) What type of symmetry do the echinoderms have? ________________________
4.) Describe what a “water vascular system” is and how does it work? ___________________________
____________________________________________________________________________
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5.) Is the oral surface ventral or dorsal? __________________
6.) Is the aboral surface ventral or dorsal? ____________________
7.) For each structure shown below, give its proper name.
B
A
C
F
D
E
8.) List and describe two characteristics that echinoderms have in common with chordates (animals with a
dorsal tubular nerve cord). a.) ______________________________________________________
b.) __________________________________________________________________________
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9.) Describe the process by which each member of this phylum obtains food:
Sea Star - ____________________________________________________________________
Sea Urchin - ___________________________________________________________________
Sea Cucumber - ________________________________________________________________
10.) What structures are primarily responsible for gas exchange and excretion of ammonia? __________
____________________________________________________________________________
11.) Do echinoderms have a proper circulatory system? ________________
12.) Describe the limited visual ability of sea stars. ________________________________________
____________________________________________________________________________
13.) Describe the behavioural adaptations used by echinoderms to survive most clever predators that
they encounter. ________________________________________________________________
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14.) Sea stars have the ability to regenerate, what does this mean and what must each part contain? ____
____________________________________________________________________________
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15.) How many arms does the sun star have (pg 642)? _______________
16.) Other than having long spikes, what is another defense mechanism that some sea urchins possess? __
____________________________________________________________________________
17.) List two echinoderms that are considered to be delicacies in some parts.
a.) _________________________________
b.) _____________________________
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