Differences between regular and irregular echinoids

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  • Differences between regular and irregular echinoids
    • Mode of life
      • Benthonic, Epifaunal, Vagrant on the seabed, High Energy
      • Benthonic, Infaunal, Lives in burrows, Low Energy
    • Feeding
      • Uses jaws to graze on seabed, algae which grows on rock
      • Filter feeds
    • Symmetry
      • Five-fold radial (5 planes)
      • Bilateral (1 plane)
    • Ambulacra
      • Run from cntre of aboral surface to oral surface
      • Run from centre of aboral surface but terminate forming petaloid ambulacra
    • Interambulacra
      • Run from centre of aboral to the oral surface
      • Modified over test. Fused together over oral. Maybe modified e.g. one forming the plastron
    • Function of tube feet
      • Respiration, attachment and movement
      • Respiration, digging and maintaining the burrow/anal tube
    • Fascioles
      • Absent
      • Two present, one to direct water to mouth, one to direct waste away
    • REGULAR
    • IRREGULAR

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