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Java Games: Flashcards, matching, concentration, and word search. |
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Echinoidea
Sae Urchins, Sand Dollars
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| echinoid | about 900 species of "hedgehoglike" echinoderms |
| test | a rigid, compact endoskeleton encircling the internal organs |
| Aristotle's lantern | a complex jawlike mechanism for grinding food |
| habitat | sea bottom |
| spherical | shape of sea urchins |
| tube feet | used for locomotion |
| teethlike structures | used for scraping algae from hard surfaces |
| barbs | found on the long spines, and sometimes, with venom |
| anus | excretory end of the digestive tract |
| ampullae | the bulblike sac inside the endoskeleton that connects to the tube feet and aids in motion and suction |
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