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  • Notochord, which is a characteristic feature of chordates, is present only in larval tail inOption: 1 Herdmania

Notochord, which is a characteristic feature of chordates, is present only in larval tail in

Option: 1

Herdmania


Option: 2

Salpa


Option: 3

Amphioxus


Option: 4

Both A and B


Answers (1)

best_answer

Phylum Urochordata - Characteristics Features -

  • These animals are also called tunicates because of the presence of cellulose-like carbohydrate material called tunic that covers the outer body surface of these animals. 
  • They possess notochord only during the larval stage. The notochord at this stage is confined to the tail region only. 
  • The adult tunicates have only one feature of chordates, i.e., pharyngeal gill slits. The notochord, nerve cord and post-anal tail disappears in adults. 
  • They are hermaphroditic animals. The larvae hatch from the eggs inside the body of adult tunicate.  
  • Most of the Urochordates are sessile.
  • They feed on plankton and detritus.
  • The following figure shows the comparative diagrams of larval and adult tunicate:

- In urochordates, the notochord is present only in tail. Herdmania and Salpa are urochordates. Option 4 is correct 

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Rishabh

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