Identify the organism that is NOT a pseudocoelomate.
Scorpions
The correct answer is scorpion.
Key Points
- Coelom is a fluid-filled cavity between the body wall and the gut wall.
- The coelom is lined by mesoderm.
- The coelom is one of the distinctive features of higher animals (metazoans).
- Based on the presence or absence of a coelom, organisms are classified into three groups:
- Coelomates
- Pseudocoelomates
- Acoelomates
- In pseudocoelomates, the body wall is not lined by mesoderm.
- Aschelminthes are pseudocoelomate organisms.
Additional Information
- The coelom is the main body cavity in most animals, located between the gut tube and the body wall.
- Coelomate refers to animals that have a body cavity called coelom filled with fluid located within the mesoderm. Examples of coelomate animals include annelids, mollusks, arthropods, and echinoderms.
- Pseudocoelom means "false coelom" or "false cavity".
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