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Echinoderms
What is an Echinoderm? Echinoderms are characterized by spiny skin, an internal skeleton, a water vascular system, and suction-cuplike structures called Tube Feet Most echinoderms exhibit a five-part radial symmetry
Anatomy of Echinoderms
The Water Vascular System
The Water Vascular System (continued) The water Vascular System, which is filled with fluid, carries out many essential body functions in echinoderms Among these functions are respiration, circulation, and movement The Madreporite is the opening to the outside
Tube Feet A Tube Foot is a structure  that operates like suction cups. Think of an Octopus, or the end of a rubber dart on a toy gun. Now, multiply that by hundreds of times to get an idea of how many a Sea Star has
Feeding Sea Stars are carnivorous. They wrap around bivalve animals like clams or mussels, use their tube feet to break them open, and push their own stomach out into the shell to break the clam down with its stomach enzymes
Feeding (continued) Other animals, like this Feather Star, are filter feeders Feather Stars stretch their tube feet and hope to catch as much plankton as they can from the sea
Feeding (continued) Sea Cucumbers act like the vacuum cleaners of the sea. They crawl around and eat all the algae and debris from the ocean floor Sea Urchins scrape rocks and the sea floor with their needles and eat all the algae they can find
Respiration and Circulation Oxygen, food processing, and waste are carried out by the Water Vascular System Sea Stars also use their Tube Feet to excrete gas and oxygen while other species use skin gills to breathe
Reproduction Echinoderms reproduce by external fertilization Both types of gametes are excreted into the open water where fertilization occurs Larvae can freely swim around before settling into the sea floor to mature into adults
Nervous System Echinoderms lack a complex Nervous System Echinoderms lack a brain, but they make up for it in a simple system of scattered nerve cells around their body which can sense light, gravity, and chemicals released by potential prey
Types of Echinoderms Sea Stars are the most common Echinoderms and perhaps the most famous They are slow-moving and have rough skin If torn into pieces, each piece can regenerate as long as a piece of the central part of their body is intact
Types of Echinoderms (continued) Like a Sea Star, only faster. Brittle Stars have longer and slender arms compared to Sea Stars Like a lizard who can shed its tail to distract a predator, Brittle Stars can shed an arm or two to escape their predators
Types of Echinoderms (continued) Sea Urchins and Sand Dollars are detritivores (underwater grazers) who eat algae Sea Urchins defend themselves by using their sharp needles, and Sand Dollars can burrow under sand and mud to escape their predators
Types of Echinoderms (continued) Sea Cucumbers are little underwater vacuum cleaners They are essential to the ecosystem since they eat all debris andorganic matter from the sea floor. Without them, swimming at sea would be like swimming in an unclean fish tank
Types of Echinoderms (continued) Feather Stars and Sea Lilies are among the world’s oldest living creatures They look like little Palm Trees stretching up to the sea and collect plankton with their tube feet
Echinoderms in Popular Media

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Echinoderms

  • 2. What is an Echinoderm? Echinoderms are characterized by spiny skin, an internal skeleton, a water vascular system, and suction-cuplike structures called Tube Feet Most echinoderms exhibit a five-part radial symmetry
  • 5. The Water Vascular System (continued) The water Vascular System, which is filled with fluid, carries out many essential body functions in echinoderms Among these functions are respiration, circulation, and movement The Madreporite is the opening to the outside
  • 6. Tube Feet A Tube Foot is a structure that operates like suction cups. Think of an Octopus, or the end of a rubber dart on a toy gun. Now, multiply that by hundreds of times to get an idea of how many a Sea Star has
  • 7. Feeding Sea Stars are carnivorous. They wrap around bivalve animals like clams or mussels, use their tube feet to break them open, and push their own stomach out into the shell to break the clam down with its stomach enzymes
  • 8. Feeding (continued) Other animals, like this Feather Star, are filter feeders Feather Stars stretch their tube feet and hope to catch as much plankton as they can from the sea
  • 9. Feeding (continued) Sea Cucumbers act like the vacuum cleaners of the sea. They crawl around and eat all the algae and debris from the ocean floor Sea Urchins scrape rocks and the sea floor with their needles and eat all the algae they can find
  • 10. Respiration and Circulation Oxygen, food processing, and waste are carried out by the Water Vascular System Sea Stars also use their Tube Feet to excrete gas and oxygen while other species use skin gills to breathe
  • 11. Reproduction Echinoderms reproduce by external fertilization Both types of gametes are excreted into the open water where fertilization occurs Larvae can freely swim around before settling into the sea floor to mature into adults
  • 12. Nervous System Echinoderms lack a complex Nervous System Echinoderms lack a brain, but they make up for it in a simple system of scattered nerve cells around their body which can sense light, gravity, and chemicals released by potential prey
  • 13. Types of Echinoderms Sea Stars are the most common Echinoderms and perhaps the most famous They are slow-moving and have rough skin If torn into pieces, each piece can regenerate as long as a piece of the central part of their body is intact
  • 14. Types of Echinoderms (continued) Like a Sea Star, only faster. Brittle Stars have longer and slender arms compared to Sea Stars Like a lizard who can shed its tail to distract a predator, Brittle Stars can shed an arm or two to escape their predators
  • 15. Types of Echinoderms (continued) Sea Urchins and Sand Dollars are detritivores (underwater grazers) who eat algae Sea Urchins defend themselves by using their sharp needles, and Sand Dollars can burrow under sand and mud to escape their predators
  • 16. Types of Echinoderms (continued) Sea Cucumbers are little underwater vacuum cleaners They are essential to the ecosystem since they eat all debris andorganic matter from the sea floor. Without them, swimming at sea would be like swimming in an unclean fish tank
  • 17. Types of Echinoderms (continued) Feather Stars and Sea Lilies are among the world’s oldest living creatures They look like little Palm Trees stretching up to the sea and collect plankton with their tube feet