Marine Biology: Echinoderms

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bananavocado
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189389
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Marine Biology: Echinoderms
Updated:
2012-12-13 20:06:47
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Marine Biology Echinoderms
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Marine Biology: Echinoderms
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  1. what does echinodersm mean?
    spiny skinned
  2. give characteristics
    • -usually have 5 point radial symmetry
    • -have an internal skeleton
    • -tube feet
    • -over 5000 species
    • -breathe through skin or tube feet
    • -MARINE only
  3. what are the major types of echinoderms? and which organisms are found there
    • Asteroidea: Sea Star
    • Echinodea: san dollars and sea urchins
    • ophiuroidea: brittle stars and basket stars
    • holothuridea: sea cucumbers
    • crinoidea: sea lilies and feather stars
  4. characterize asteroidea
    • -5 point symmetry
    • -benthic
    • -has 5 appendages
  5. what do asteroideas eat?
    • bivalves (clams and muscles)
    • othe sea stars
  6. how do sea stars digest?
    externally
  7. which sea star is a cannibal?
    sun star
  8. how does the tube feet work?
    moves through use of water vascular system - water fills tube feet and hydrostatic pressure occurs
  9. how do asteroidea reproduce
    • -separate sexes (cannot be determined externally
    • -fertilization is external
    • -development is external and larvaes live as meroplanktons until grown up
  10. characterize echinodea
    • -round body
    • -no arms
    • -bodies are enclosed by a hard endoskeleton
    • -can be found in shallow waters to deep seas
  11. what do echinodeas prefer?
    • solid/ rocky substrates
    • -hebivores (they eat algea, seaweed, and kelp.)
    • -can often be dangerous to kelp forests
  12. how do echinodeas (sea urchins) move?
    • use spines and tube feet to move. NO arms.
    • have an endoskeleton made of calcium carbonate
    • -have toxins in spines and can be painful
  13. so there's the sea urchin, what else in apart of the chinodeas?
    sand dollars
  14. characterize sand dollars
    • have short spines to help them burrow in the sand.
    • filter feeders and use spines to catch planktons and organic matter
  15. describe a sea biscuit
    thicker than the sand dollar and also a filter feeder.
  16. characterize ophiuroidea
    -largest class of echinoderms
  17. characterize brittle stars:
    • -nocturnal: active at night. Usually hides under rocks and tight places during the day
    • -dos not use tube feet
    • -fastest of all echinoderms
    • -can regenerate arms also
    • -have large flattened central disks
  18. how do ophiuroidea eat
    suspension feeders that gather particles
  19. where are basket stars found? how do they eat
    deep sea only. suspension feedes and use their branches to catch and trap food
  20. characterize the holothuridea class
    sea cucumbers.

    • -no skeleton
    • -no arms
    • -filter feeders
    • -uses hydrostatic pressure to elongate body and adjsut its texture
  21. what happens whatn holothurideas are disturbed?
    release sticky tubules from their anus and it adheres to potential predators.
  22. what's evisceration?
    when agitated or threatened, sea cucumbers will release their digestive organs to avoid being eaten.
  23. characterize crinoideas
    • -includes sea lilies and feather strs
    • -ancient species which look like flowers and are the most primitive
  24. how do crinoideas feed?
    suspension feeders

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