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Phylum: EchinodermataPhylum: Echinodermata
The Spiny-skinned AnimalsThe Spiny-skinned Animals
Phylum: Echinodermata
Echino – spiny
Derm – skin
Spiny-Skinned Animals
Sea Lily –
Tunicate Cove,
Belize
Echinodermata Characteristics
Bilateral as larvae and then Radial as adults
Triploblastic
Complete digestive system
Radial nervous system with no brain
Water Vascular System (no blood)
Echinoderms
have a unique
system called
the water
vascular
system. It
allows them to
move, eat, and
exchange gases
with their
environment.
Ring
canal
Radial
canal
Ampulla
Tube Feet
Madreporite
Tube feet on sea stars are
located on the ventral
side of the arms. They
can be pulled into slits
called ambulacral
grooves.
Tube feet on sea stars are
located on the ventral
side of the arms. They
can be pulled into slits
called ambulacral
grooves. Water is
pumped into the tube feet
from the ampullae (see
previous slide) to cause
the tip of the tube foot to
widen into a suction cup.
Tube feet on sea stars are
located on the ventral
side of the arms. They
can be pulled into slits
called ambulacral
grooves. Water is
pumped into the tube feet
from the ampullae (see
previous slide) to cause
the tip of the tube foot to
widen into a suction cup. By moving each tube foot in tiny steps
in a synchronized fashion, echinoderms are able to walk on
them. The steps are so small that the animal appears to be
gliding.
Four Classes of Echinoderms
Class: Asteroidea – sea stars
Intro to Echinoderms Notes
Brittle stars have long,
stringy arms. They
move by walking with
their arms. Their tube
feet are like cleats to
provided added traction.
Intro to Echinoderms Notes
Four Classes of Echinoderms
Class: Asteroidea – sea stars
Class: Echinoidea – sea urchins
South Water Caye, Belize
Intro to Echinoderms Notes
Four Classes of Echinoderms
Class: Asteroidea – sea stars
Class: Echinoidea – sea urchins
Class: Holothuroidea – sea cucumbers
Sea Cucumbers
Four Classes of Echinoderms
Class: Asteroidea – sea stars
Class: Echinoidea – sea urchins
Class: Holothuroidea – sea cucumbers
Class: Crinoidea – crinoids/sea lillies

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Intro to Echinoderms Notes

  • 1. Phylum: EchinodermataPhylum: Echinodermata The Spiny-skinned AnimalsThe Spiny-skinned Animals
  • 2. Phylum: Echinodermata Echino – spiny Derm – skin Spiny-Skinned Animals
  • 3. Sea Lily – Tunicate Cove, Belize
  • 4. Echinodermata Characteristics Bilateral as larvae and then Radial as adults Triploblastic Complete digestive system Radial nervous system with no brain Water Vascular System (no blood)
  • 5. Echinoderms have a unique system called the water vascular system. It allows them to move, eat, and exchange gases with their environment. Ring canal Radial canal Ampulla Tube Feet Madreporite
  • 6. Tube feet on sea stars are located on the ventral side of the arms. They can be pulled into slits called ambulacral grooves.
  • 7. Tube feet on sea stars are located on the ventral side of the arms. They can be pulled into slits called ambulacral grooves. Water is pumped into the tube feet from the ampullae (see previous slide) to cause the tip of the tube foot to widen into a suction cup.
  • 8. Tube feet on sea stars are located on the ventral side of the arms. They can be pulled into slits called ambulacral grooves. Water is pumped into the tube feet from the ampullae (see previous slide) to cause the tip of the tube foot to widen into a suction cup. By moving each tube foot in tiny steps in a synchronized fashion, echinoderms are able to walk on them. The steps are so small that the animal appears to be gliding.
  • 9. Four Classes of Echinoderms Class: Asteroidea – sea stars
  • 11. Brittle stars have long, stringy arms. They move by walking with their arms. Their tube feet are like cleats to provided added traction.
  • 13. Four Classes of Echinoderms Class: Asteroidea – sea stars Class: Echinoidea – sea urchins
  • 16. Four Classes of Echinoderms Class: Asteroidea – sea stars Class: Echinoidea – sea urchins Class: Holothuroidea – sea cucumbers
  • 18. Four Classes of Echinoderms Class: Asteroidea – sea stars Class: Echinoidea – sea urchins Class: Holothuroidea – sea cucumbers Class: Crinoidea – crinoids/sea lillies