Zoology (Optional) By Dheeraj Sharma :  
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Chordates are animals characterized by the presence of notochord at some stage during their development. Members possess a hollow nerve cord and pharyngeal gill slits.

The general characteristic features of Chordates are : 
  • They are bilaterally symmetrical, triploblastic, and coelomate with the organ-system level of organization. 
  • They hold a post-anal tail.
  • The body includes a closed circulatory system. 
  • In some members of Phylum Chordata, the notochord is present only in the larval tail, and in some, it is present throughout their life from head to tail region. 
  • Chordates have many sub-divisions and Protochordates are one of the earliest to evolve.
Complete Chordata : UPSC-CSE/IAS/IFoS

Complete Notes/Book By Dheeraj Sharma (Chordata) : UPSC-CSE/IAS/IFoS
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Chordata : UPSC-CSE/IAS/IFoS
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