Question:
In Caecilians, vertebrae are:
In Caecilians, vertebrae are:
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Amphicoelous vertebrae are common in primitive vertebrates like fishes and caecilians.
Updated On: Jun 20, 2026
- Procoelous
- Opisthocoelous
- Amphicoelous
- Heterocoelous
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The Correct Option is C
Solution and Explanation
Step 1: Understanding Caecilians.
Caecilians are limbless amphibians belonging to the class Amphibia, adapted for burrowing lifestyle.
Step 2: Vertebral structure concept.
Vertebrae in different vertebrates show different shapes at their articulating ends such as procoelous, opisthocoelous, amphicoelous, etc.
Step 3: Meaning of amphicoelous vertebrae.
Amphicoelous vertebrae are those in which both anterior and posterior ends are concave.
Step 4: Evolutionary significance.
Such vertebrae allow flexibility and uniform bending, which is useful in elongated burrowing animals like caecilians.
Step 5: Evaluating options.
- Procoelous: anterior concave, posterior convex.
- Opisthocoelous: anterior convex, posterior concave.
- Heterocoelous: saddle-shaped (birds).
Step 6: Final conclusion.
Thus, caecilians have amphicoelous vertebrae.
Caecilians are limbless amphibians belonging to the class Amphibia, adapted for burrowing lifestyle.
Step 2: Vertebral structure concept.
Vertebrae in different vertebrates show different shapes at their articulating ends such as procoelous, opisthocoelous, amphicoelous, etc.
Step 3: Meaning of amphicoelous vertebrae.
Amphicoelous vertebrae are those in which both anterior and posterior ends are concave.
Step 4: Evolutionary significance.
Such vertebrae allow flexibility and uniform bending, which is useful in elongated burrowing animals like caecilians.
Step 5: Evaluating options.
- Procoelous: anterior concave, posterior convex.
- Opisthocoelous: anterior convex, posterior concave.
- Heterocoelous: saddle-shaped (birds).
Step 6: Final conclusion.
Thus, caecilians have amphicoelous vertebrae.
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