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Wonders of the Sea - Echinoderms
  
Pearl Sea Starby BBM Explorer on Flickr

Echinoderms

  • are spiny skinned animals
  • don't have a backbone
  • are armored animals that have a hard endoskeleton made of interlocking calcium carbonate plates and spines. 
  • use tube feet to move
  • can regenerate a new arm if one breaks off
  • move slow
  • live in tidal pools
  • The word echinoderm means "spiny skin."

Modern-day echinoderms have five-fold symmetry, having arms or rays in multiples of five. Some fossil echinoderms did not have five-fold symmetry.
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Hi, There!by Peter Kaminski on Flickr

Sea Stars

  • Starfish or sea stars are echinoderms
  • Starfish move using tube feet.
  • Some species of starfish have the ability to regenerate lost arms and can regrow an entire new limb given time
  • Most species are predators, eating mollusks such as clams,oysters, some snails, or any other animal too slow to evade their attack (e.g. other echinoderms, or dying fish)
  • Starfish remove their stomachs through their mouths in order to eat their prey. The starfish then puts its stomach back inside of its body.
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Brittle star on the beach at Whalers Bay, Deception Islandby Liam Quinn on Flickr

Brittle Stars

  • Brittle stars  are closely related to starfish
  • Brittle stars use their arms for locomotion. 
  • They do not depend on tube feet for locomotion - moving.

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Doraku (Sai) - Sea Cucumber - netsuke - Raymond and Frances Bushell Collection - LACMAby Marshall Astor - Food Fetishist on Flickr

Sea Cucumbers
  • Sea Cucumbers are scavengers, feeding on debris in the the ocean
  • The have numerous tube feet, often with suckers, that allow the animal to crawl along
  • Evisceration is used by animals as a defensive strategy. 
    • Sea cucumbers  eject parts of the gut in order to scare predators.
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14 Sea Urchin and 10 Abalone from Linley Point Reef, Morningtonby avlxyz on Flickr

Sea Urchin
  • Sea urchins are small, spiny, round animals
  • Urchins have tube feet
  • They have spines, long and sharp that help protect the urchin from predators
  • Sea urchins feed  on algae, but can also feed on sea cucumbers and brittle stars.


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IMG_1603by Duane Burdick on Flickr

Tidal Pools

  • Tide pools are rocky pools by oceans that are filled with seawater.
  • Many animals live in tidal pools
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