Questions and Answers
What is Crinoidea?
What is the defining feature of Asteroidea?
They have a water vascular system that moves tube feet for movement.
Ophiuroidea includes __________ and __________.
Brittle stars and basket stars
Which of the following describes Echinoidea?
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What unique ability do Holothuroidea have?
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Study Notes
Classes of Echinoderms
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Crinoidea:
- Includes feather stars and sea lilies.
- Can move using their arms while being attached to the seabed.
- Filter feeders utilizing tube feet for food capture.
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Asteroidea:
- Commonly known as sea stars.
- Utilize a water vascular system to move tube feet for mobility.
- Unique feeding method involves pushing their stomachs into the shells of clams.
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Ophiuroidea:
- Comprises brittle stars and basket stars.
- Characterized by rapid movement using their arms.
- Tube feet are present but lack suckers, unlike other echinoderms.
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Echinoidea:
- Encompasses sea urchins and sand dollars.
- Covered with small projections aiding in movement.
- Sand dollars are known for burrowing and feeding on organic waste, while sea urchins possess spines and primarily consume algae.
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Holothuroidea:
- Consists of sea cucumbers which exhibit bilateral symmetry.
- Use tentacles to capture food that is directed to the mouth.
- Notable for their ability to regenerate their stomach and primarily feed on sediment.
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Explore the unique characteristics and definitions of the five classes of echinoderms through interactive flashcards. Ideal for students learning about marine biology and echinoderm diversity. Test your understanding of Crinoidea, Asteroidea, Ophiuroidea, and beyond!
