echinodermata
TRANSCRIPT
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Nikki&
Portia Ophioderma rubicundum
Brittle Star
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Classification of animal in Phylum
• five well-defined clases: • Crinoidea (sea lilies and feather
stars),• Ophiuroidea (basket stars and brittle
stars) • Asteroidea (starfishes)• Echinoidea (sea urchins, sand dollars,
and sea biscuits)• and Holothuroidea (sea cucumbers).
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Body form
Spiny-skinnedOr wart-like bumpssymmetricalCan loose up to 3 limbs
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Reproduction
• Echinoderms have the ability to regenerate new parts asexually.
• They also have separate sexes with reproductive organs in each arm.
• Sexual reproduction involves releasing gametes into the water (external fertilization).
• Seahorses: males give birth
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Digestive System
Urchins are herbivores (they eat plants)
starfish are predators and scavengersother feed on waste.
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Respiratory System
• Gills on the skin which exchange gases
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Living Environment
• Mainly marine environment
• Live in slightly salty water
• Live in shallow and deep waters.
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Circulatory System
Open circulatory system
Cilia circulates fluids through the arms.
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Interaction with humans
• They are more related to humans than any other invertebrate.
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Unique Features
• External skeletons
• There is no head
• Usually have mouth on the underside
• Anus usually on top
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Pictures!!
Sea Urchin
Sea Cucumber
Basket Star
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Citing
Various Authors. Think Quest. May 21, 2009.
<http://library.thinkquest.org/28751/review/animals/7.html>