Coelacanths, powerful predators with limb-like fins, appeared about 350 million years ago. Once considered the missing link between fish and tetrapods, they were thought to have become extinct 80 million years ago—until one was caught in 1938 near the southern coast of Africa in the Indian Ocean. They are deep-sea fish with hollow fin spines and average 5 ft (1.5 m) in length and weigh approximately 100 lb (45 kg). How is the coelacanth’s heart different from those of other vertebrates? Discuss

Source: The Free Dictionary

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