Cnidarians
JJ Wright & Jack Weidenbach
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Groups/Divisions of Cnidarians
Anthozoa
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Sea fans
Corals
Sea pens
Sea anemones
Cubozoa
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Chironex fleckeri
Tripedalia cystophora
Catostylus mosaicus
Hydrozoa
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Athecate Hydroids
Thecate Hydroids
Siphonophores
Scyphozoa
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Helmet Jelly
Lion's Mane Jellyfish
Moon Jelly
Reproductive Habits and Development
Body plan/symmetry
Tissues, organs and cell specialization
Feeding mechanisms and digestion.
Body coverings/skin
Respiration
Circulation
Excretion
Locomotion/Appendages
Skeleton and musculature
Nervous system control
Life history/fossil record
Ecological/economical importance
Bibliography
Circulation
Cnidarians don't have a circulatory system.
Because they breathe through diffusion, no circulation is needed because all cells get the same amount oxygen. (w3.shorecrest.org)
Diffusion is usually only helpful for animals with a very high [surface area to volume ratio].
Taringa!