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C)Coelacanth
Coelacanths were once thought to have undergone extinction 66 million years ago during the Cretaceous–Paleogene extinction event. ... The fossil record is unique because coelacanth fossils were found 100 years before the first live specimen was identified.
Coelacanth marine creature was thought to be extinct for 80 million years until one was caught off the coast of Madagascar in 1938. Thus, the correct option is C.
The most important feature of Coelacanth "living fossil" is its paired lobe fins that elongate away from its body like legs and move in an oscillating pattern. An oil filled tube known as a notochord, that serves as a backbone, thick scales common present only in extinct fish, and an electro-sensory rostral organ present in its snout likely used to detect prey.
The primitive coelacanth was thought to have gone extinct with the dinosaurs 80 million years ago. But its discovery in 1938 by a South African museum curator (coast of Madagascar) on a local fishing trawler amazed the world and raised a debate about how this large lobe-finned fish fits into the evolution of land animals.
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