Answer: coelacanths

AnswerCrossword Clue
coelacanthsCOELACANTH, any of a group of primitive crossopterygian fishes
coelacanthsA large, bony marine fish with a three-lobed tail fin and fleshy pectoral fins. It is thought to be related to the ancestors of land vertebrates and was known only from fossils until one was found alive in 1938; since then others have been found near the Comoro Islands in the Indian Ocean and off Sulawesi, Indonesia