Question

In which of the following notochord is absent?

• A. Adult Herdmania and Balanoglossus
  
• B. Adult Herdmania and adult Branchiostoma
  
• C. Larva of Herdmania and Branchiostoma
  
• D. Larva of Herdmania and Balanoglossus
  

Answer 1

The correct option is A Adult Herdmania and Balanoglossus

• Herdmania is an urochordate animal. In Urochordata, the notochord is present only in the larval tail.
• Balanoglossus is a hemichordate animal. Hemichordata is placed as a separate phylum.
• They share several chordate features, including a rudimentary notochord-like structure, the stomochord.
  
• This stomochord is like a flexible, hollow tube found in the body part of the buccal diverticulum.
  
• Both animals lack notochord in the adult stage.

So, the correct answer is option A.