Class Cyclostomata


 
 
Concept Explanation
 

Class Cyclostomata

These eel-like jawless organisms are the most primitive vertebrates. Their characteristics are :

  • They are animals with a cartilaginous endoskeleton and a rodlike notochord.
  • Their gills are enclosed in pouches elongaed into 6-15 pairs of gill slits ofr respiration.
  • The skin is smooth, soft, slimy and scaleless.
  • The circulatory system includes a two-chambered heart.
  • They are ectoparasites which stick to fish. A round suctorial mouth with a rasping tongue helps them do this.
  • They are unisexual and fertilization takes place outside the body, or is external.
  • Example: Lampreys and hagfish are included in this class.

                                                              

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    Sample Questions
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    Question : 1

    The cyclostomata  are ___________ and fertilization in them takes place _________.

    Right Option : B
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    Question : 2

    Eel like jawless organisms are the members of which of the following class of  subphylum vertebrata ?

    Right Option : C
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    Explanation
    Question : 3

    Which of the following organism have cartilaginous skeleton and have round suctorial mouth with a rasping tongue ?

    Right Option : A
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    Explanation
     
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