Question:
Which of the following groups constitute eucoelomates?
Which of the following groups constitute eucoelomates?
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Eucoelomates = True coelom → Schizocoelomates + Enterocoelomates.
Updated On: Jul 18, 2026
- Acoelomates & Pseudocoelomates
- Schizocoelomates & Pseudocoelomates
- Schizocoelomates & Enterocoelomates
- Enterocoelomates & Pseudocoelomates
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The Correct Option is C
Solution and Explanation
Step 1: Understanding coelom types.
Coelom is a body cavity present between the gut and body wall. Animals are classified based on presence or absence of coelom into acoelomates, pseudocoelomates, and eucoelomates. Eucoelomates possess a true coelom lined by mesoderm.
Step 2: Types of eucoelom formation.
Eucoelomates are further divided based on embryonic origin of coelom formation. These include schizocoelomates (coelom formed by splitting of mesoderm) and enterocoelomates (coelom formed from archenteron outpocketing).
Step 3: Characteristics of schizocoelomates.
In schizocoelomates, the mesoderm splits to form a cavity. This type is mainly seen in annelids, arthropods, and molluscs, representing true coelom development.
Step 4: Characteristics of enterocoelomates.
In enterocoelomates, the coelom arises as outpocketing of the embryonic gut (archenteron). This is typical of echinoderms and chordates, both of which are true coelomates.
Step 5: Evaluation of options.
Acoelomates lack coelom, and pseudocoelomates possess a false coelom, so they are not eucoelomates. Only schizocoelomates and enterocoelomates belong to true coelomate group.
Step 6: Final conclusion.
Thus, the correct combination representing eucoelomates is schizocoelomates and enterocoelomates.
Coelom is a body cavity present between the gut and body wall. Animals are classified based on presence or absence of coelom into acoelomates, pseudocoelomates, and eucoelomates. Eucoelomates possess a true coelom lined by mesoderm.
Step 2: Types of eucoelom formation.
Eucoelomates are further divided based on embryonic origin of coelom formation. These include schizocoelomates (coelom formed by splitting of mesoderm) and enterocoelomates (coelom formed from archenteron outpocketing).
Step 3: Characteristics of schizocoelomates.
In schizocoelomates, the mesoderm splits to form a cavity. This type is mainly seen in annelids, arthropods, and molluscs, representing true coelom development.
Step 4: Characteristics of enterocoelomates.
In enterocoelomates, the coelom arises as outpocketing of the embryonic gut (archenteron). This is typical of echinoderms and chordates, both of which are true coelomates.
Step 5: Evaluation of options.
Acoelomates lack coelom, and pseudocoelomates possess a false coelom, so they are not eucoelomates. Only schizocoelomates and enterocoelomates belong to true coelomate group.
Step 6: Final conclusion.
Thus, the correct combination representing eucoelomates is schizocoelomates and enterocoelomates.
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