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Etymology. The word Coelacanth is an adaptation of the Modern Latin Cœlacanthus (hollow spine), from the Greek κοῖλος (koilos hollow + ἄκανθα akantha spine). It is a common name for the oldest living line of Sarcopterygii, referring to the hollow caudal fin rays of the first fossil specimen described and named by Louis Agassiz in 1839.
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