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Lily B

on 6 April 2016

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Transcript of Echinoderms

Echinoderms are invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system.
Body Structure
- have an endoskeleton
-skin is stretched over the endoskeleton
-made of plates, gives animal a bumpy texture
-radial symmetry, usually multiples of five
They use their tube feet to move. Tube feet act like small, sticky suction cups.
Move slowly.
Obtaining Food
-use their tube feet to capture food
-move along slowly while catching food
- most are carnivores, but some are omnivores
-some eat algae and others eat shellfish
Stable Conditions
-they live in salt water
-can't survive in fresh water
-some prefer rocky others while others like sandy areas so they can bury themselves
-Almost all Echinoderms are male or female
-Reproduce sexually and asexually
-The female releases her egg and the male releases his sperm
-The sperm fertilizes the egg
-The fertilized eggs develop into swimming larvae
-The larvae eventually undergo metamorphosis and become adult echinoderms
-maintain stable conditions by homeostasis
-adapt to match the color of their surroundings
-all cold blooded, so they move where the sun is
(Purple Sea Urchin)
- They are considered
delecacies in Japan.
- Spawn in the winter
or early spring.
- Most of the time
they are stationary.
(Brittle Starfish)
- Bury themselves
for protection.
- Their arms come
off but grow back.
- They are usually
found in large
Encope Michelini
(Arrowhead sand dollar)
- found in shallow
parts of the ocean.
- live for 6-10 years.
- sand dollars are
flattened sea urchins.
Full transcript