A correction, a question and a comment.
First the comment. Excellent rhetoric. It could probably fool anyone unaccustomed to critical thinking.
The correction: The coelecanth was thought to be extinct during, or at the end of, the Cretecaeous, not 50,000 years ago.
The question: Given that no fossil coelocanth had been found in strata younger than the Cretaceous and no living examples had been found, why do you think it was a mistake to think it was extinct?
Back up question: do you prefer to rely on supposition rather than confirmed observations?
And to be wholly accurate the Coelecanth fossils found represent species that are extinct because the extant species are different to those in the fossil record (because Coelecanth is not a species name, its a name for a group of species).
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