EchinodermataBy Eryia & Amp
General CharacteristicsSpiny skinInternal skeletonWater-vascular systemDeuterostomesSymmetrical animalsThey have many small, movable extensions of the water-vascular system called tube feet.
AdaptationsThe echinoderm will change its body shape from bilaterally symmetrical to radically symmetrical, and in the process, settle down on the sea floor.
They crawl slowly along the ocean floor which allows them to move from place to place.
3 Interesting FactsStarfish do not have blood.They also have tube feet which allows them to move.Not all starfish have 5 arms.
CLASSIFICATIONTaxonomists divide the 7,000 species of echinoderms into six classes. Here are a few..
Class CrinoideaIncludes : sea lilies and feather starsIn both types of crinoids, five arms extend from the body and branch to form many more arms- up to 200 in some feather star species.The mouth faces up in crinoids, while in most other echinoderms the mouth faces toward the sea bottom.Cilia on the arms transport trapped food to the crinoids mouth at the base of the arms.
Class OphiuroideaThe 2,000 species of basket stars and brittle stars make up the largest echinoderm class.Members of this class are distinguished by their long, narrow arms, which allow them to move more quickly than other echinoderms.Basket stars and brittle stars live primarily on the bottom of the ocean, often beneath stones or in the crevices and holes of coral reefs.
Class AsteroideaThe sea star, or starfish belong to this class. They exist in a variety of colors and shapes.Sea Stars are economically important because they prey on oysters, clams, and other organisms that humans use as food.
Kingdom: AnimaliaPhylum: EchinodermataClass: AsteroideaOrder: SpinulosidaFamily: AcanthastGenus: Acanthaster Species: Planci
Crown-of-thorns starfishHabitat: The Great ReefsFood Source: coral polyps. Size:40 mm in diameter
Royal sea star
Kingdom: Animalia Phylum: EchinodermataClass: AsteroideaOrder: PaxillosidaFamily: AstropectinidaeGenus: AstropectenSpecies: Articulatus
Royal Sea StarHabitat: tropical coral reefs Food Source: algae Size: under in. to over 3 ft. in diameter.
Kingdom: AnimaliaPhylum: EchinodermataClass: CrinoideaOrder: ComatulidaFamily: AntedonidaeGenus: AntedonSpecies: bifida
Antedon bifidaHabitat: rocks, sedentary animalsFood Source: algaeSize: in. to over 3 ft. in diameter.
Is it eaten by humans ??
Yes!!!!!, they are. Humans usually stay away from them but in countries like Japan, they are eaten.
Does human pollution affect it?
Yes they are affected by the human pollution. Sewage discharge and urban runoff has been what's most affecting these starfish
VocabularyWater-vascular system: a network of water-filled canals inside their body.Tube feet: small, movable extensions of the water-vascular system, which aid in movement, feeding, respiration, and excretion.Ossicles: an endoskeleton composed of calcium carbonate plates.
Resourceshttp://www.oceanicresearch.org/education/wonders/echinoderm.htmlhttp://marinelife.about.com/od/invertebrates/tp/seastarfacts.htmhttp://news.bbc.co.uk/earth/hi/earth_news/newsid_8378000/8378512.stmFeldkamp, Susan, and I. Edward.Alcamo. ModernBiology.Austin, TX: Holt, Rinehart and Winston, 2002 p.780-783http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Astropecten_articulatus.html