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The modern day whale.
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Teeth were reduced and elbows became immobile. First evidence of baleen for fish feeding was found.
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Very long and snakelike, tail ends with a small fluke.
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Completely aquatic - forelimbs became flippers, trunk was elongated, hind limbs shrunk in size, tail flukes evolved, and nostrils moved farther back of the skull.
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Sea-lion like but spent some time on land. Forelimbs were for walking and swimming while hind limbs were big in size.
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Had a more aquatic lifestyle; tail was longer and more muscular, shorter legs, enlarged paddle-like feet and hands. It was alligator-like and fed in the both salt and freshwater.
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Quite small land animals with long skulls, big carnivorous teeth, nostrils far in front, limbs for walking, and no tail flukes.
