Chapter 33 - Iowa State University

Leader: Adam
Course: Biology 211
Instructor: Dr. Holscher
Chap 33:
Supplemental Instruction
Iowa State University
First review the last part of chapter 32:
1. What other way rather than looking at the various body plans have scientists began comparing different animals
to each other?
2. Between Ecdyozoa and Lophtrochozoa, which shed an exoskeleton? And what is this process called? Which
develop a feed structure called a lophophore?
Chapter 33 begins…
1. Eumetazoa vs. Parazoa
2. Sponges: Phylum ________
a. Have no ____________tissue
b. Suspension feeders that utilize what cell to capture food?
c. How do they reproduce?
i. Hermadphrodites:
ii. Sequential hermaphroditism:
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iii. Eggs remain in the ____________. Sperm are carried out of the
sponge by ________ _______.
iv. Zygotes develop into _____________ swimming ________, that disperse
from the parent sponge until it finds a structure to clinch to.
v. This clinching to an object such as a rock is termed what!?
Eumetazoa, Radiata:
3. Phylum Cnidaria
a. What some animal examples?
b. Basic Body plan:
i. Two types
c. Are carnivores that use tentacles armed with ________________ to capture prey.
Eumetazoa, Bilateria, Protostomia
4. Phylum Platyhelminthes
a. What are they?
b. Basic Body Plan
i. Lack specialized __________ and ________ systems to transport gases
ii. Lack a true ______________cavity.
iii. Turbellarians are a class of platyhelminthes, best know freshwater
turbellarians are called what?
c. How does a tapeworm receive oxygen and nutrients then?
d. Blood Fluke: looking at the life cycle, what would be most effective method to
reduce it in humans?
5. Phylum Rotifers
a. How do they reproduce?
6. Phylum Lophophorates
a. What are they?
i. Phoronids: tube-dwelling marine worms
ii. Bryozoans: colonial animals resembling plants
iii. Brachiopods: resemble __________ but have shell halves that are
_______ and _____ rather than _________.
b. How do they feed?
7. Phylum Molluscs : examples are snails, oysters, octopuses, squids
a. Basic Body Plan:
b. Gastropod Development, explain torsion…