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Discover the fascinating world of echinoderms, marine creatures with an internal skeleton, radial symmetry, and a water vascular system. Explore their evolutionary connection to vertebrates, their unique digestive system, and their ability to regenerate body parts. Dive into the five classes of echinoderms, including crinoids, sea stars, brittle stars, sea urchins, and sea cucumbers.
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KEY CONCEPTEchinoderms are on the same evolutionary branch as vertebrates.
Echinoderms have an internal skeleton made of interlocking ossicles. digestive glands anus central disk radial canal ring canal reproductive glands Echinoderms have radial symmetry.
Echinoderms have a water vascular system. tube feet • a series of water-filled ring canals around central disk • canals store water used for circulation and movement • changes in water pressure extend and retract tube feet
Some echinoderms can regenerate limbs or other body parts. • Echinoderms have a complete digestive system. • Most echinoderms reproduce sexually.
There are five classes of Echinoderms. • Feather stars and sea lilies are in the class Crinoidea.
There are five classes of Echinoderms. • Sea stars are in the class Asteroidea.
There are five classes of Echinoderms. • Brittle stars and basket stars are in the class Ophiuroidea.
There are five classes of Echinoderms. • Sea urchins, sea biscuits, and sand dollars are in the class Echinoidea.
Sea cucumbers are the only members of the class Holothuroidea. There are five classes of Echinoderms.
