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Write any five differences between chondricthyes and osteichthyes

Answer»

Chondrichthyes: 

  • They are marine animals with streamlined body 
  • Cartilaginous endoskeleton. 
  • Mouth is located ventrally. 
  • Gill slits are separate and without operculum (gill cover) 
  • The skin is covered by minute placoid scales. 
  • Due to the absence of air bladder, they have to swim constantly to avoid sinking. 
  • They are mostly viviparous 
  • Fertilization is internal  

Osteichthyes: 

  • It includes both marine and fresh water fishes 
  • Bony endoskeleton. 
  • Mouth is mostly terminal. 
  • The gills are covered by an operculum on each side. 
  • Skin is covered with cycloid/ctenoid scales. 
  • Air bladder is present which regulates buoyancy. 
  • They are mostly oviparous 
  • Fertilization is external


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