Name
Class
Date
Skills Worksheet
Echinoderms and Invertebrate Chordates
Write the correct term from the list below in the space next to its definition.
atriopore
echinoderm
ossicles
test
tube foot
water-vascular system
_______________________ 1. opening by which water leaves the body of a
lancelet
_______________________ 2. extension of the water-vascular system that aids
movement
_______________________ 3. group of invertebrates that includes sea stars, sand
dollars, sea urchins, and sea cucumbers
_______________________ 4. calcium-rich plates that make up the endoskeleton
of an echinoderm
_______________________ 5. a water-filled system of interconnected canals and
thousands of tiny, hollow tube feet
_______________________ 6. fused, rigid endoskeleton
In the space provided, write the letter of the description that best matches the
term or phrase.
______ 7. pedicellaria
a. contracts and forces water
into the tube feet
______ 8. radial canal
b. bilaterally symmetrical larva
______ 9. ampulla
c. keeps the body free of
foreign objects
______10. bipinnaria
d. carries water directly to the
tube feet
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Modern Biology
75
Vocabulary Review
Name
Class
Date
Assessment
Echinoderms and Invertebrate Chordates
In the space provided, write the letter of the description that best matches the
term or phrase.
______ 1. madreporite
______ 2. tunicate
______ 3. incurrent siphon
______ 4. postanal tail
______ 5. sea cucumber
______ 6. sea urchin
a. a chordate that lacks a nerve cord as
an adult
b. an armless echinoderm with protruding
spines
c. an armless echinoderm with a soft,
sluglike body
d. the structure through which water enters a
tunicate’s body
e. a structure that extends beyond the anus
f. the structure through which water enters
and leaves the water-vascular system
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
______ 7. Most adult echinoderms have which of the following?
a. an asymmetrical body
b. five-part radial symmetry
c. five-part bilateral symmetry
d. two-part bilateral symmetry
______ 8. Sea lilies and feather stars differ from all other living echinoderms
because their mouth
a. develops from the blastopore.
b. is disk-shaped.
c. is located on the lower surface.
d. is located on the upper surface.
______ 9. Which of the following is a sessile chordate?
a. sea star
c. lancelet
b. tunicate
d. sand dollar
______10. Animals that have a notochord but do NOT have a backbone are called
a. protostomes.
c. vertebrates.
b. echinoderms.
d. invertebrate chordates.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Modern Biology
75
Quiz