| 11. | "Paracorynactis hoplites " are highly efficient predators of echinoderms.
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| 12. | Commercially harvested echinoderms include sea cucumbers and sea urchins.
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| 13. | Such a skeleton is present in echinoderms and chordates.
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| 14. | All echinoderms are marine and nearly all are benthic.
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| 15. | Echinoderms sometimes have large population swings which can cause marked consequences for ecosystems.
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| 16. | Starfish and other echinoderms are sensitive to marine pollution.
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| 17. | Appendage regeneration in echinoderms has been studied since at least the 19th century.
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| 18. | However, some echinoderms have developed bilateral symmetry secondarily.
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| 19. | Echinoderms primarily use their tube feet to move about.
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| 20. | There are many important differences between chordates and echinoderms.
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