Biology 11
Mrs. Knowles
Chapter 29: Echinodermata and Chordata
ECHINDODERMATA
Characteristics
1) Endoskeleton
2) Radial symmetry, but larvae have bilateral symmetry
Advantage of radial symmetry:
Larvae:
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3) Water vascular system
Functions:
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4) Central nerve ring
5) Deuterostomes
Definition:
Classes of Echinoderms
1) Asteroidea
Includes:
Characteristics:
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Feeding:
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2) Ophiuroidea
Includes:
Characteristics:
Feeding:
3) Echinoidea
Includes:
Characteristics:
Feeding:
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4) Holothuroidea
Includes:
Characteristics:
Feeding:
5) Crinoidea
Includes:
Characteristics:
Feeding:
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6) Concentricycloidea
Includes:
Characteristics:
Feeding:
Origins of echinodermata
Biology 11
Mrs. Knowles
Phylum Chordata
Three subphyla:
1) Urochordata
2) Cephalochordata
3) Vertebrata
CHARACTERISTICS OF CHORDATES: ** at some point during development**
A. Notochord
B. Dorsal hollow nerve cord
C. Pharyngeal pouches / slits
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D. Postanal tail
Other characteristics of chordates:
Subphylum Urochordata: Tunicates
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Subphylum Cephalochordata : Lancelets
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Origins
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Echinoderms
1. What characteristic is shared by all echinoderms?
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2. What type of symmetry do most adult echinoderms have?
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3. What is the water vascular system in echinoderms used for?
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4. What type of asexual reproduction can occur in starfish?
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5. What must be present for this type of reproduction to occur?
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Chordates
1. List the four general characteristics shared by all chordates.
a. ________________________________________________________________________
b. ________________________________________________________________________
c. ________________________________________________________________________
d. ________________________________________________________________________
2. What is the main difference between invertebrate chordates and vertebrate chordates?
Biology 11
Mrs. Knowles
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