Questions and Answers
What is the classification of radially symmetrical marine invertebrates including starfish and sea urchins?
What class do sea lilies and feather stars belong to?
Crinoidea
What is the class name for sea daisies?
Concentricycloidea
What class do sea stars belong to?
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What class do brittle stars belong to?
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What class includes sea urchins and sand dollars?
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What is the class for sea cucumbers?
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What are tube feet?
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What function do pedicellariae serve?
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What is a madreporite?
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What comprises the water vascular system of an echinoderm?
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What is the purpose of the stone canal?
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What is the ring canal in echinoderms?
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Study Notes
Echinodermata Overview
- Echinodermata are radially symmetrical marine invertebrates.
- Common examples include starfish, sea urchins, and sea cucumbers.
Phylum Classification
- The Echinodermata phylum includes various classes such as sea stars, sea cucumbers, and sand dollars.
Classes of Echinoderms
- Crinoidea: Known as sea lilies and feather stars, this class is characterized by a cup-like structure and long arms.
- Concentricycloidea: Comprises sea daisies, unique for their disc-like shape and limited distribution.
- Asteroidea: This class includes sea stars, which are recognized for their star-shaped bodies and regenerative abilities.
- Ophiuroidea: Contains brittle stars, distinguished by their long, flexible arms and unique feeding mechanisms.
- Echinoidea: Encompasses sea urchins and sand dollars, with rigid bodies and various forms of spines or shells.
- Holothuroidea: Represents sea cucumbers, which have elongated bodies and exhibit soft, leathery textures.
Water Vascular System
- A critical feature of echinoderms, it comprises a system of canals filled with watery fluid, enabling movement and feeding.
- The madreporite acts as a sieve-like structure, opening the water vascular system to the outside environment.
- The stone canal connects the madreporite to the ring canal within sea stars.
Key Structures
- Tube Feet: Extensions of the water vascular system used for locomotion and food acquisition, protruding from the body.
- Pedicellariae: Tiny pincer-like structures on sea stars and some sea urchins, utilized for surface maintenance to keep clean from debris.
Water Vascular System Components
- The ring canal is a circular canal near the mouth, integral to the function of the water vascular system in echinoderms.
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Description
Test your knowledge on the fascinating world of echinoderms with this set of flashcards. Learn about various classes, characteristics, and examples of echinoderms like starfish and sea cucumbers. Perfect for marine biology enthusiasts or students studying marine invertebrates.
