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Phylum Echinodermata Echinoderms only live in the seasExamples are sea star, sea urchins, brittle
stars, sea lilies, and sand dollars
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Echinoderm CharacteristicsNo cephalizationMost have two
surfaces: Oral surface: where
the mouth is locatedAboral surface: the
opposite side where the anus is
Larvae have Bilateral Symmetry; Adults have Radial Symmetry
Internal skeleton is formed of hardened plates of calcium carbonate
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Echinoderms: Water Vascular System• Water vascular system used to carry out
respiration, circulation, and movement• Suction-cup like tube feet used to walk or
pry open prey such as clams
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Echinoderm Feeding• Echinoderm species feed on various things;
some are predators and some are detritivores.• A sea star can push its own stomach out of its
mouth, pours out enzymes, and digest a mollusk right in its own shell.Watch the 3 minute video below to see how this
happens!Click here to see video. Then click on:
“22o K” on the right side of the screen under the picture.
Echinoderms release solid waste from their anus.
Echinoderm Response and Movement• Do not have a highly
developed nervous system; no cephalization
• Have sensory cells to detect light, gravity, and chemicals released by potential prey
• Small muscle fibers are attached from the endoskeleton to tube feet to aide in locomotion
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Echinoderm ReproductionExternal Fertilization occurs as eggs and
sperm are released into the water.
The young larvae have bilateral symmetry but develop into adults with radial symmetry.
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