Originally the coelacanth was believe to be a transitional form between fish and amphibians. This was because its bone structure was different from most present-day fish. The coelacanth fish was believed to be extinct. However, in 1938 a fisherman caught two living coelacanths. He brought them to some scientists who studied the creature. After studying the creatures soft tissue they realized that the coelacanth was merely a fish and not a transitional form.
“If the case of the coelacanth illustrates anything, it shows how difficult it is to draw conclusions about the overall biology of organisms from their skeletal remains alone. Because the soft biology of extinct groups can never be known with any certainty, then obviously the status of even the most convincing intermediates is bound to be insecure.” – Michael Denton