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  1. Feb 01, 2019 · Mammals evolved on land around 160 million years ago. Each taxonomic marine mammal group evolved from a different group of land mammals, whose ancestors separately ventured back into the ocean environment. Despite these different origins, many marine mammals evolved similar features — streamlined bodies, paddle-like limbs and tails ...

  2. Terrie Williams, Professor of Ecology & Evolutionary Biology, UC Santa Cruz, and Director of the Marine Mammal Physiology Project, Long Marine Lab It has taken 50 million years for cetaceans and pinnipeds to evolve into the largest, most efficient predators in the oceans.

  3. May 21, 2007 · A recurrent theme in tetrapod evolution is a return to an aquatic habitat. Whereas amphibians never quite parted with the water, all other tetrapod groups (reptiles, birds, and mammals) have several representatives that have returned to the water for at least an amphibious lifestyle of some degree, if not a fully aquatic existence.

    • Mark D. Uhen
    • 150
    • 2007
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  5. Mar 21, 2012 · This is an exciting time to study marine mammal evolution as many of the most important discoveries in this field have been made in the last 10-15 years, and there is no reason to expect that pace ...

  6. Evolution of Marine Mammals: Back to the Sea After 300 Million Years MARK D. UHEN* Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC ABSTRACT The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions. Five of these clades are still

    • Mark D. Uhen
    • 150
    • 2007
  7. Evolution of mammals. The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. By the mid- Triassic, there were many synapsid species that looked like mammals. The lineage leading to today's mammals split up in the Jurassic ...

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