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Biology 11Mrs. 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) OphiuroideaIncludes:

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

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Phylum Chordata

Three subphyla:

1) Urochordata2) Cephalochordata3) 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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Echinoderms1. 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 11Mrs. Knowles

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