Answer to Question #143033 in Zoology for RamC

Question #143033
Why is knowledge of the Sarcopterygii lineage so important in understanding the evolution of
terrestrial vertebrates?
1
Expert's answer
2020-11-16T09:29:57-0500

 They are important for the study of evolutionary processes involved in the water to land transition of vertebrates. The evolution of a true neck, that is, the complete separation of the pectoral girdle from the cranium, is one of the most intriguing morphological transitions known among vertebrates.

The lobe-finned fishes are the sister group to the ray-finned fishes. They are characterized by their paired, fleshy pectoral, and pelvic fins that are each articulated via a single bone. Ancestral records clearly show us that terrestrial vertebrates evolved from lobe-finned fishes nearly 400 million years ago.


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