Class 11 Biology Animal Kingdom Class Chondrichthyes

Class Chondrichthyes

  • They are marine animals with streamlined body and have cartilaginous endoskeleton.
  • Notochord is persistent throughout life and separated gill slits are without operculum.
  • The skin is tough, containing minute placoid scales.
  • Some of them have electric organs, such as Torpedo and some possess poison sting such as Trygon.
  • They are cold-blooded (poikilothermous) animals.
  • Sexes are separate, fertilizationis internal and they are mostly viviparous.

Examples-Scoliodon (Dog fish), Pristis (Saw fish).

Class_11_Biology_AnimalKingdom_Sawfish

Fig. Saw fish

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