Science Notebook - Student Edition

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282 Echinoderms and Invertebrate Chordates

Echinoderm

Diversity

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Ecology of

Echinoderms

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Name the class of each echinoderm described below.

Echinoderm Class Characteristics

cucumber shape; leathery covering;

tentacles near mouth

body encased in a test; burrows

often five arms; arms regenerate; no

suction cups on tube feet

often five arms; tube feet used for

feeding and movement

no arms; tube feet located around a

central disk

sessile for some part of life

List echinoderm strategies for coping with potential predators.

sea stars:

brittle stars:

sea urchins:

sea cucumbers:

Analyze the effect of echinoderms on other organisms in the

following situations.

Activity as bioturbators:

Unexplained population explosions of crown-of-thorns sea stars:

Section 27.1 Echinoderm Characteristics (continued)

Give an example of regeneration in humans. Then give an Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

example of regeneration in echinoderms that is beyond the capability of humans.

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