echino = spinydermis = skin. phylum echinodermata echinoderms only live in the seas examples are sea...

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Echino = spiny Dermis = skin

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Echino = spiny Dermis = skin

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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•Digestive System Green

•Male or Female Reproductive System Dark blue or Pink

•Water vascular system Light blue or turquoise

•Nervous System Orange

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