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 | | As in extant cetaceans, Ambulocetus swam by means of dorsoventral undulations of its vertebral column, as evidenced by the shape of the lumbar vertebra. |
 | | In terms of their skeletal structure, however, whales are distinguished from the similar Mesonychids using five basic anatomical characteristics: (1) all of the incisors are parallel with the tooth row, (2) the medial lamboidal crest is semicircular, (3) the nasals are retracted, (4) the protocones are small, and (5) the accessory cusps are large. |
 | | Beginning with terrestrial Mesonychids, we can trace the path through Ambulocetus, which was a terrestrial animal that spent much time in the water, to Basilosaurus, which had nearly lost its functional legs, to the later Archaeocetes, which possessed no external legs at all and were specialized for a deep-sea life, to the modern whales. |
| www.geocities.com /CapeCanaveral/Hangar/2437/ambulo.htm (2697 words) |
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