7th grade-ch. 2 sec. 5 echinoderms

CH. 2 SEC. 5

ECHINODERMS

characteristics of characteristics of echinoderms:echinoderms:

• radially symmetricalradially symmetrical• invertebrateinvertebrate• live on ocean floorlive on ocean floor• endoskeleton endoskeleton

(spiny internal (spiny internal skeleton)skeleton)

• water vascular water vascular systemsystem

(internal fluid system)(internal fluid system)• tube feettube feet

examples :examples :• 1. sea star1. sea star

• 2. sea urchin2. sea urchin

• 3. sand dollar3. sand dollar

• 4. brittle star4. brittle star

• 5. sea 5. sea cucumbercucumber

1.1. 2.2.

3.3. 4.4.

5.5.

sea starssea stars

1. sea stars1. sea stars•use arms & tube feet to capture preyuse arms & tube feet to capture prey

•grasp clamgrasp clam opens it w/ its tube opens it w/ its tube feetfeet forces its stomach into clam forces its stomach into clam digestive chemicals break down digestive chemicals break down clam’s tissuesclam’s tissues sucks it out sucks it out

•can regenerate armscan regenerate arms

regenerationregeneration•process by which animal process by which animal

grows a new part to replace a grows a new part to replace a lost onelost one

2. sea urchins2. sea urchins•no armsno arms

•covered w/ spinescovered w/ spines

•look like pincushionslook like pincushions

3. Sand 3. Sand dollarsdollars

4. 4. Brittle Brittle starsstars

5. sea 5. sea cucumbercucumber

Name 5 examples of Name 5 examples of echinoderms.echinoderms.

• 1. sea star1. sea star

• 2. sea urchin2. sea urchin

• 3. sand dollar3. sand dollar

• 4. brittle star4. brittle star

• 5. sea 5. sea cucumbercucumber

What are the characteristics of What are the characteristics of echinoderms?echinoderms?

• radially symmetricalradially symmetrical• invertebrateinvertebrate• live on ocean floorlive on ocean floor• endoskeleton endoskeleton

(spiny internal (spiny internal skeleton)skeleton)

• water vascular water vascular systemsystem

(internal fluid system)(internal fluid system)• tube feettube feet

regenerationregeneration•process by which animal process by which animal

grows a new part to replace grows a new part to replace a lost onea lost one

How do sea stars capture How do sea stars capture their prey?their prey?

•use arms & tube feet to capture use arms & tube feet to capture preyprey

•grasp clamgrasp clam opens it w/ its tube opens it w/ its tube feetfeet forces its stomach into forces its stomach into clamclam digestive chemicals break digestive chemicals break down clam’s tissuesdown clam’s tissues sucks it out sucks it out