Which characteristic distinguishes Pseudocoelomata from Coelomata?
Understand the Problem
The question asks about the key difference between Pseudocoelomates and Coelomates based on their body cavity characteristics. Understanding the nature of their body cavities is the key to correctly answering the question.
Answer
Pseudocoelomata have a body cavity not fully lined by mesoderm, unlike Coelomata which have a fully lined cavity.
The key difference lies in the body cavity lining: in Pseudocoelomata, the body cavity isn't fully lined by mesoderm, whereas in Coelomata, the body cavity (coelom) is completely lined by mesoderm.
Answer for screen readers
The key difference lies in the body cavity lining: in Pseudocoelomata, the body cavity isn't fully lined by mesoderm, whereas in Coelomata, the body cavity (coelom) is completely lined by mesoderm.
More Information
The presence or absence of a coelom, and its structure, is a key feature in animal classification. The coelom allows for greater flexibility, space for organ development, and a hydrostatic skeleton in some animals.
Tips
It's easy to confuse the terms coelomate, pseudocoelomate, and acoelomate. Remembering that 'true' coelomates have a body cavity fully lined with mesoderm is key.
Sources
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