Question Detail
Question
Which group of following animals possesses mesenchymal coelom?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Phoronida (horseshoe worms) possess a mesenchymal coelom, which is a type of coelom where the cavity is filled with mesenchyme (connective tissue). While most protostomes and deuterostomes have a true coelom lined with peritoneum, Phoronida has a coelom that is partially or largely filled with mesenchymal tissue. Nemertina (ribbon worms) have a rhynchocoel (a fluid-filled cavity for the proboscis), not a mesenchymal coelom.
Hint
Consider the lophophorate phyla, which often have a coelomic system that is somewhat different from typical protostomes and deuterostomes.