Question

Stomochord is found in

• A. Vertebrate
• B. Hemichordata
• C. Invertebrates
• D. Both A and B

Answer 1

The correct option is B Hemichordata

• Hemichordata closely relates to the Chordates.
• It contains marine deuterostome animals. They have a tubular structure known as stomochords.
• Stomochords arise in embryonic development as an out-pocketing from the roof of the embryonic gut anterior to the pharynx.
• In adults, they extend dorsally from the pharynx into the proboscis and serve to communicate with the oral cavity.
• Their walls are composed primarily of epithelial cells, but ciliated and glandular cells are also present.

So, the correct answer is option B.