Phylum Echinodermata

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Last updated: April 29, 2026

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Hint	Answer
What do echinoderms use for locomotion?	The water-vascular/ambulacral system
What is the name of the visible spot on the aboral end of an echinoderm?	Madreporite
Name for the spines of the internal skeleton	Ossicles
What kind of symmetry do echinoderms primitively have?	Secondary pentamerous radial symmetry
Which class contains the sea stars?	Asteroidea
Where are the ambulacral grooves?	On the oral-side arms
Which class contains the basket stars and serpent stars?	Ophiuroidea
What do serpent stars primarily use their arms for?	Locomotion
Which class contains the urchins and sand dollars?	Echinoidea

Hint	Answer
Which class contains the sea cucumbers?	Holothuroidea
What have sea cucumber tube feet evolved into?	Oral tentacles
What makes irregular echinoids unique?	Biradial symmetry, flat, fur-like spines, no podia
How do sea cucumbers facilitate respiration?	Respiratory trees
Which class contains the sea lilly and feather stars?	Crinoidea
Which class contains the sea daisy?	Concentricycloidea
What determines whether or not a crinoid is motile or sessile?	Whether it is stalked
Where have sea daisies been found?	On sea logs