Question

Think about living amphibians and diapsids for a minute. Limb reduction and/or loss has occurred independently in several groups. List some of these groups or type of animal. What about their niche/biology promotes this (to our eyes) extreme adaptation?

Answer 1

Answer:

• Living amphibians and diapsids occupy/occupied niches that were aquatic. In aquatic ecosystems, streamlining of the body is important for improved locomotion.
• An organism with shortened limbs can more easily streamline it's body by folding the limbs backward, parallel to the long axis of the body (the anterior-posterior axis).
• Improved locomotion in aquatic settings would improve the chances of escape from predators and also improve the chances of catching prey, thereby improving the overall fitness of the species to survive in that particular niche.
• Therefore, limb reduction acted as a beneficial trait for amphibians and diapsids, by improving overall fitness of the various species in the group.

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