4 Fundamental Character of Chordata | Free Biology Notes

fundamental character of chordata

Fundamental Character of Chordata

After reading this article you will learn about fundamental character of chordata

Fundamental Character of Chordata

1. Presence of notochord

  • In Embryonic stage of chordate animals there is a solid stick/rod like structure called notochord
  • It is present just below nerve cord and above alimentary canal
  • Notochord is extended from anterior to posterior end of body at dorsal surface
  • It is mesodermal in origin
  • In protochordate, it persists throughout life
  • In vertebrates, it is replaced by backbone / vertebral column in adults

2. Presence of nerve cord

  • In chordates CNS is situated at dorsal surface of body
  • Nerve cord is single, hollow and tubular
  • Nerve cord is present below the body wall and just above notochord
  • Nerve cord is ectodermal in origin

3. Presence of pharyngeal gill slits

  • In each chordate animal there are paired lateral gill slits in wall of pharynx for respiration in any stage of life span
  • In aquatic chordates and lower chordates pharyngeal gill slits are present throughout their life span for respiration
  • In terrestrial chordates, gill slits are found only in embryonic stages and are absent in adults as they have lungs

4. Presence of post anal tail

  • In chordates tail if present is the post anal part of body
  • Tail is reduced or absent in many adult chordates

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Rajkumar is a lecturer from TamilNadu, India. He holds a master degree in botany. Passionate, Blogger, Video Creator, Photography. He helps the students for advancement and provide Biology Materials. Life Motto: Live while you can! Teach and inspire while you could & smile while you have teeth


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