Water Vascular System
Anatomy & Symmetry
Classes of Echinoderms
Movement & Feeding
Vocabulary Challenge
100
This structure controls the water intake into the water vascular system.
What is the madreporite?
100
Adult echinoderms have this type of symmetry.
What is radial symmetry?
100
Sea stars belong to this class.
What is Asteroidea?
100
Sea stars use this structure to pry open clams.
What are tube feet?
100
The ability to regrow lost body parts.
What is Regeneration?
200
These structures are used for movement and are powered by water pressure.
What are tube feet?
200
This internal skeleton is made of calcium carbonate plates.
What is an endoskeleton?
200
Sea urchins and sand dollars belong to this class.
What is Echinoidea?
200
Sea stars digest their food using this unusual method.
What is everting their stomach?
200
Small calcium plates that form the endoskeleton.
What are Ossicles?
300
This internal canal runs in a circle around the mouth.
What is the ring canal?
300
This small claw-like structure helps protect and clean the body surface.
What are pedicellariae?
300
Brittle stars belong to this class.
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What is Ophiuroidea?
300
Sea urchins use this five-toothed structure to scrape food.
What is Aristotle’s lantern?
300
Bulb-like structure that controls tube feet movement.
What are Ampulla?
400
These canals extend down each arm of a sea star.
What are radial canals?
400
Echinoderm larvae have this type of symmetry.
What is bilateral symmetry?
400
Sea cucumbers belong to this class.
What is Holothuroidea?
400
Brittle stars primarily move using these instead of tube feet.
What are their arms?
400
A fluid-filled body cavity that surrounds internal organs.
What is a Coelom?
500
This structure connects the radial canal to each tube foot.
What is the lateral canal?
500
Specifically, echinoderms have this kind of radial symmetry.
What is pentaradial symmetry?
500
Feather stars belong to this class.
What is Crinoidea?
500
Sea cucumbers defend themselves by ejecting these sticky organs.
What are Cuvierian tubules?
500
Skin gills used for gas exchange.
What are Dermal Branchiae (Papulae)?