Which group forms the coelom by separation of mesoderm cells?

Which group forms the coelom by separation of mesoderm cells?

• A. Schizocoelomates
• B. Enterocoelomates
• C. Deuterostomes
• D. Acoelomates

Answer: (A)

Schizocoely is the process where a solid mass of mesoderm splits apart to create the coelomic cavity. That separation of mesoderm cells forms the body cavity directly, which is the hallmark of schizocoelomates. This contrasts with enterocoely, where coelom forms as pouches from the gut endoderm that pinch off to become coelomic spaces. Acoelomates lack a coelom entirely, and deuterostomes are a broader group that includes lineages forming the coelom by enterocoely. So, the group defined by forming the coelom through separation of mesoderm cells is schizocoelomates.

Schizocoely is the process where a solid mass of mesoderm splits apart to create the coelomic cavity. That separation of mesoderm cells forms the body cavity directly, which is the hallmark of schizocoelomates. This contrasts with enterocoely, where coelom forms as pouches from the gut endoderm that pinch off to become coelomic spaces. Acoelomates lack a coelom entirely, and deuterostomes are a broader group that includes lineages forming the coelom by enterocoely. So, the group defined by forming the coelom through separation of mesoderm cells is schizocoelomates.