Echinodermata Asteroidea - Mt. San Antonio College · Echinodermata . Feather Star . Class...
Transcript of Echinodermata Asteroidea - Mt. San Antonio College · Echinodermata . Feather Star . Class...
Class Ateroidea - The Sea Star
Knobby Sea Star Pisaster giganteus Note blue around spines
Ochre Sea Star Pisaster ochraceus
Class Ophiuroidea - Banded Brittle Star
• Common under rocks in the middle intertidal • Feed on detritus on bottom
Class Echinoidea Sea Urchins
Sea urchins graze on kelp using an apparatus called “Aristotle’s Lantern”. It is equipped with intricate and efficient jaws.
Sea Star: External Anatomy
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1. Central disc
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2. Madreporite or seive plate
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3. Arm
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4. Mouth 5. Ambulacral gooves 6. Tube feet
7. Sensory tentacles
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Phylum Echinodermata Class Asteroidea Cross Section of Sea Star Arm
Pyloric Caeca
Coelomic Cavity
Dermal Ossicle
Tube Foot
Sea Star Arm Cross Section
Coelomic Cavity
1. Pyloric ceca 2. Ampullae 3. Radial canal 4. Lateral canal
5. Tube foot 6. Gonad
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Pyloric ceca Dermal ossicle
Water Vascular System of Echinoderms
1. Stone canal
2. Ring canal 3. Lateral canal 4. Radial canal 5. Ampulla 6. Tube foot
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