Class Asteroidea Have 5 arms usually




Дата канвертавання25.04.2016
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Phylum Echinodermata Classes

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Class Asteroidea

1. Have 5 arms usually

2. Mouth located in center of oral surface

pointing downward

3. Has a Water Vascular System with tube feet

4. Has Mouth and Stomach

5. Has short intestine – extends from stomach to

anus.

6. Endoskelton made up of calcareous plates that

penetrate the dermis as spines

7. Between the spines and plates are projections

called papulae, which function in gas

exchange and excretion

8. Other projections on the body wall include tiny

jaw-like appendages called pedicellaria

9. Has Photoreceptors

10. Examples: Starfish, Brittle stars



Class Asteroidea

1. Have 5 arms usually

2. Mouth located in center of oral surface

pointing downward

3. Has a Water Vascular System with tube feet

4. Has Mouth and Stomach

5. Has short intestine – extends from stomach to

anus.

6. Endoskelton made up of calcareous plates that

penetrate the dermis as spines

7. Between the spines and plates are projections

called papulae, which function in gas

exchange and excretion

8. Other projections on the body wall include

tiny jaw-like appendages called Pedicellaria

9. Has Photoreceptors

10. Examples: Starfish, Brittle stars



Class Ophiuroidea

1. Characteristics similar to class Asteroidea

2. Main difference between starfish and brittle

stars is brittle stars have much thinner arms.

3. Examples: Brittle stars


Class Ophiuroidea

1. Characteristics similar to class Asteroidea

2. Main difference between starfish and brittle

stars is brittle stars have much thinner arms.

3. Examples: Brittle stars



Class Echinoidea

1. No arms

2. Body is enclosed in a shell or test

3. Body surface is usually covered with

moveable spines

4. Spherical body

5. Ambulacral plates bearing tube feet that

radiate out toward the aboral surface

6. Use podia and spines during locomotion

7. The spines are moveable and articulate

with the with the calcareous ossicles

8. Examples: Sea Urchins, Sand Dollars

9. Feeding – Scrap algae off of rocks then

using a chewing apparatus called

Aristotle's Lantern



Class Echinoidea

1. No arms

2. Body is enclosed in a shell or test

3. Body surface is usually covered with

moveable spines

4. Spherical body

5. Ambulacral plates bearing tube feet that

radiate out toward the aboral surface

6. Use podia and spines during locomotion

7. The spines are moveable and articulate

with the with the calcareous ossicles

8. Examples: Sea Urchins, Sand Dollars

9. Feeding – Scrap algae off of rocks then

using a chewing apparatus called

Aristotle's Lantern


Class Holothuroidea

1. No arms

2. Endoskeleton is reduced to a few Ossicles

on the surface

3. Fairly soft-bodied

4. Locomotion – using false feet and by

muscular contractions

5. Examples: Sea Cucumber

6. Oral end of the body has a group of

tentacles surrounding the mouth; used

in feeding

7. Have a muscular cloaca that is partly used

in gas exchange

8. Gas exchange structures are branching

structures called respiratory trees


Class Holothuroidea

1. No arms

2. Endoskeleton is reduced to a few Ossicles

on the surface

3. Fairly soft-bodied

4. Locomotion – using false feet and by

muscular contractions

5. Examples: Sea Cucumber

6. Oral end of the body has a group of

tentacles surrounding the mouth; used

in feeding

7. Have a muscular cloaca that is partly used

in gas exchange

8. Gas exchange structures are branching

structures called respiratory trees


Class Crinoidea

1. Most primitive of echinoderms

2. Oral surface is upward

3. Has a stalk

4. Body portion attached to the stalk is the

crown;

5. Has branches called pinnules

6. Ciliated around the mouth



Class Crinoidea

1. Most primitive of echinoderms

2. Oral surface is upward

3. Has a stalk

4. Body portion attached to the stalk is the

crown;

5. Has branches called pinnules

6. Ciliated around the mouth



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