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Echinoidea. Harrison Cassidy, Lauren Bower, Ren ée Carew, Tosin Fashoranti. Introduction. Phylum Echinodermata Regular and Irregular Found in all intertidal zones ~1000 known species. Evolutionary History. Regular echinoids 450 million years ago during the Ordovician Period

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echinoidea

Echinoidea

Harrison Cassidy, Lauren Bower, Renée Carew, TosinFashoranti

introduction
Introduction
  • Phylum Echinodermata
  • Regular and Irregular
  • Found in all intertidal zones
  • ~1000 known species
evolutionary history
Evolutionary History
  • Regular echinoids
    • 450 million years ago during the Ordovician Period
  • Irregular echinoids
  • Ancestral deuterostome
  • Believed to evolve from the edioasteriods
regular echiniods
Regular Echiniods
  • Water vascular system
    • Locomotion
    • Respiration
    • Food an waste transportation
  • Aristotle’s lantern
  • Bilateral symmetry
  • Test (aka the shell)
  • Movable spines
  • Inhabit the ocean floor
  • Omnivores
irregular
Irregular
  • Not formally a group
  • Penta-radial & bilateral symmetry
  • Anus on the side rather than apex
heart urchin
Heart Urchin
  • About 2 inches in diameter
  • Muddy areas, burrowing up to 6 inches
  • Most common in depths under 160ft
sand dollar
Sand Dollar
  • Shallow, sandy areas
  • Flattened
  • Miniature spines (felt like)
  • Aristotle’s Lantern (mouth) more flat & grinds sand
  • Bury themselves for defense
life cycle
Life Cycle
  • There are two types of life cycles:
    • Planktotrophy
    • Lecithotrophy
slide10

Planktotrophy

  • Several eggs are externally fertilized in the water column
  • Larval phase
  • Echinopluteus

Echinopluteus

slide11

Lecithotrophy

  • Fewer eggs that are larger
  • The eggs are externally fertilized in the mother’s pouch
  • No larval phase
fun facts
Fun facts
  • The red sea urchin can live up to 200 years or longer.
  • Sea urchin eggs are commonly eaten in sushi.
  • Sea urchins are also called “sea heghogs”.
  • They have a large fossil record due to the high calcium content in their shells.
bibliography
Bibliography
  • "The Echinoid Directory." - Natural History Museum. N.p., n.d. Web. 26 Mar. 2014. http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/intro/introduction.html
  • "Animal Diversity Web." Animal Diversity Web. N.p., n.d. Web. 26 Mar. 2014. <http://animaldiversity.ummz.umich.edu/accounts/Echinoidea/>.
  • "Introduction to the Echinoidea." The Echinoidea. N.p., n.d. Web. 26 Mar. 2014. http://www.ucmp.berkeley.edu/echinodermata/echinoidea.html
  • Follo, Judy. "Animal Diversity Web." Animal Diversity Web. University of Michigan, n.d. Web. 24 Mar. 2014. http://animaldiversity.ummz.umich.edu/accounts/Echinoidea/
  • "Investigation." Sea Urchin. N.p., n.d. Web. 25 Mar. 2014. <http://tolweb.org/treehouses/?treehouse_id=4881>.
  • "Class Echinoidea." Class Echinoidea. N.p., n.d. Web. 30 Mar. 2014. <http://encina.pntic.mec.es/~nmeb0000/invertebrates/equinodermos/gruposequinodermos/equinoideos.html>.
slide14

Heart Urchin. Digital image. Heart Urchin. N.p., n.d. Web. 24 Mar. 2014. <http://www.afsc.noaa.gov/race/media/photo_gallery/invert_files/Heart_urchin.htm>.

  • Kroh, A. & Mooi, R. (2011). World Echinoidea Database. Available online at http://www.marinespecies.org/echinoidea[accessed 2014-03-30].
  • Living Sand Dollar. Digital image. Panoramio. N.p., n.d. Web. 24 Mar. 2014. <http://www.panoramio.com/photo/20966104>.
  • Long Post Central. Digital image. (Sand Dollars!  Actually a Sort of Sea Urchin! For...). N.p., n.d. Web. 24 Mar. 2014. <http://stuckinabucket.tumblr.com/post/53620165374/sand-dollars-actually-a-sort-of-sea-urchin-for>.
  • "The Echinoid Directory." - Natural History Museum. N.p., n.d. Web. 24 Mar. 2014. <http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/intro/introduction.html>.
  • "Major Phyla Of Animals." Animal Phyla. N.p., n.d. Web. 29 Mar. 2014. <http://waynesword.palomar.edu/trnov01.htm>.
  • "The Heart Urchin." Smithsonian Marine Station at Fort Pierce. N.p., n.d. Web. 25 Mar. 2014. <http://www.sms.si.edu/IRLFieldGuide/Moira_atropo.htm>.