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9 Cards in this Set
- Front
- Back
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Class Asteroidea characteristics and examples |
Pentaradial symmetry, can repair themselves if damaged. Have a water vascular system. Ex: sea stars |
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Class Ophiuroidea characteristics and examples |
Long and flexible arms that allow for quick, agile movement. Arms can detach to distract predators. They filter feed. Ex: brittle stars |
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Class Echinodea characteristics and examples |
Spiny. Know about sea urchins and urchin barrens. Ex: sea urchins and sand dollars. |
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Class Holothuroidea characteristics and examples |
Warty moving pickles with a mouth at one end and an anus at the other. Ex: sea cucumbers |
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Class Crinoidea |
Ancient echinoderms that filter feed and live on coral reefs. Ex: feather stars, sea lilies |
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Describe the water vascular system |
The water vascular system uses back-pressure to achieve suction. Water comes through a life-like madreporite, goes down the stone canal, around the ring canal, down the radial canal, and is squeezed by ampullae to create suction at the tube feet. |
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What is the water vascular system used for? |
Respiration, circulation, locomotion, and feeding. |
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How do sea stars feed? |
They use their arms and tube feet to pry open a mollusk. They evert their stomach into the mollusk and release digestive enzymes. They absorb the nutrients, which flows down branching cecum in each arm. |
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How do sea cucumbers defend themselves? |
They eviscerate parts of their respiratory tract along with some toxins out their anus to entangle and deter predators. It takes 2-5 weeks to recover from this. |
