Phylum Echinodermata: Sand Dollars, Starfish, and Sea
UrchinsBy: Amanda Brainerd
Endoskeleton Five-part radial symmetry Water-vascular system Skin Gills No head or brain
Key Characteristics
Anatomy
Sieve Ring canal Tube feet Anus Stomach Digestive glands Skin gills Reproductive glands
Simple digestion In through mouth and down esophagus Two-stomach system Intestines Anus
Digestion
Water vascular system Tube Feet Skin Gills Bumps or Spines on surface Hemolymph Circulation
Respiration
Water vascular system Madreporite Ring Canal Water Tube Feet
Internal Transport
Anus Mouth Tube feet and skin gills No real excretion system Diffusion
Excretion
Eyespots Nerves Tube Feet Spiny Skin Statocysts
Response
Tube and thin layers of muscles Tube feet Water vascular system Suckers and arms Spines https://www.youtube.com/watch?v=
cec4YPXBnXk
Movement
Diecious Sexual Reproduction External fertilization Fission and regeneration Larvae settle on ocean floor
Reproduction
Examples
Echinodermata has approximately 7000 described living species and about 13,000 extinct species known from the fossil record.
Brittle Stars can be found at depths as great as 6000 meters.
Sea stars have up to 200 light sensitive eye spots.
Some species can live up to 10 years. Echinoderms are the most complex of
invertebrates.
Facts
http://echinodermsg.blogspot.com/2007/04/digestion.html
http://intro.bio.umb.edu/112s99Lect/bodyplans/starfish.html
http://echinodermsf.blogspot.com/2007/04/internal-transport.html
http://www.mesa.edu.au/echinoderms/ http://www.oceaninn.com/the-nature-preserve/echino
derms/
Words Cited
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