Radiates- Phylum Cnidaria and Ctenophora

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Radiates

Phylum Cnidaria 

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  • Have Nemocysts 
  • Mostly marine and all aquatic 
  • 2 forms; sessile polyp and free swimming medusa 
  • More than 9,000 species 
  • Have radial symmetry
  • Reproduction: sexual (hermaphrodite- gamtes into water --> free larva) and asexual (budding)
  • Have 2 germ layers- epidermis and gatrodermis
  • Use tentacles and nemocysts to catch food
  • No excretory or respiration systems
  • Tissue types; nerve,muscle and epithelium but NO connective tissue 
  • Habe gastrovascular cavity- for digestion and gas exchange
  • Nervous system; mechanoreceptors, photoreceptors and chemoreceptor- no central nervous system- 2 nerve nets at base of epidermis and gastrodermis
  • Have 4 major classes within this phylum;
  • Class hyrozoa 

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