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1. • About 50 million years ago

     • Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million years ago in the Eocene epoch.
     evolution-outreach.biomedcentral.com › articles › 10

     From Land to Water: the Origin of Whales, Dolphins, and ...

2. People also ask

   Did marine mammals evolve back to the sea after 300 million years?

   • Uhen MD (2007) Evolution of marine mammals: back to the sea after 300 million years. Anat Rec 290:514–22 Uhen MD (2008) A new Xenorophus-like odontocete cetacean from the Oligocene of North Carolina and a discussion of the basal odontocete radiation.

   Return to the Sea: The Evolution of Marine Mammals

   link.springer.com/chapter/10.1007/978-3-319-98280-9_2

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   When did mammalian evolution start?

   • This is no great surprise, because a great deal of mammalian evolution has been linked to changes in feeding ecology. It is also interesting to note that the clades of marine mammals seem to have originated at two discrete times, Cetacea and Sirenia during the early Eocene, and Desmostylia and Pinnipedia during the Oligocene.

   Evolution of marine mammals: Back to the sea after 300 million years

   anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.20545

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   Do marine mammals have evolutionary histories?

   • Before comparing the evolutionary histories of each of the clades of marine mammals, it is worth emphasizing that the evolutionary histories outlined here are only the most basic and superficial sketches of the morphological changes that these groups have undergone.

   Evolution of marine mammals: Back to the sea after 300 million years

   anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.20545

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   How long did it take a whale to evolve?

   • Cetacean Evolution. Graphic by Karen Brazell. The earliest whales that we think were fully aquatic, that is, they never left the water, are found around 40 million years ago, during the middle Eocene. That means that the transition from terrestrial animals to fully aquatic animals took about 12 million years.

   Ocean Giants | Going Aquatic: Cetacean Evolution - PBS

   www.pbs.org/wnet/nature/ocean-giants-going-aquatic-cetacean-evolution/7577/

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3. anatomypubs.onlinelibrary.wiley.com › doi › fullEvolution of marine mammals: Back to the sea after 300 million...

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   May 21, 2007 · Evolution of marine mammals: Back to the sea after 300 million years. Mark D. Uhen. First published: 21 May 2007. https://doi.org/10.1002/ar.20545. Citations: 144. Sections. PDF. Tools. Share. Abstract. The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions.

   • Author: Mark D. Uhen

   • Publish Year: 2007

4. evolution-outreach.biomedcentral.com › articles › 10From Land to Water: the Origin of Whales, Dolphins, and ...

   evolution-outreach.biomedcentral.com › articles › 10

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   Apr 16, 2009 · Around 34 million years ago, the first representatives of the modern groups of whales, odontocetes and mysticetes are found. It is now generally assumed that odontocetes and mysticetes (together called Neoceti) arose from a common Eocene cetacean ancestor and are thus monophyletic.

   • Author: J. G. M. Thewissen, Lisa Noelle Cooper, Lisa Noelle Cooper, John C. George, Sunil Bajpai

   • Publish Year: 2009

5. anatomypubs.onlinelibrary.wiley.com › doi › epdfEvolution of Marine Mammals: Back to the Sea After 300 ...

   anatomypubs.onlinelibrary.wiley.com › doi › epdf

   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

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7. link.springer.com › article › 10A Brief History of Marine Mammals | Journal of Mammalian ...

   link.springer.com › article › 10

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   Oct 18, 2012 · University of California Press, Berkeley, CA. 2012. 205 pp., $49.95 (cloth), $25.62 (Kindle). ISBN 9780520270572. Annalisa Berta leads readers through a vast range of topics regarding the evolution of marine mammals in Return to the Sea: The Life and Evolutionary Times of Marine Mammals. In this volume geared towards non-specialists (one might ...

   • Author: Mark D. Uhen
   • Email: muhen@gmu.edu

   • Publish Year: 2013

8. ocean.si.edu › through-time › ocean-through-timeOcean Through Time | Smithsonian Ocean

   ocean.si.edu › through-time › ocean-through-time

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   The mammals, once small and rodent-like, took advantage of the dinosaurs’ extinction and evolved in new directions, with some lineages eventually giving rise to the whales, seals, and manatees that live in the ocean today.

9. www.pbs.org › wnet › natureOcean Giants | Going Aquatic: Cetacean Evolution - PBS

   www.pbs.org › wnet › nature

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   Mar 21, 2012 · The earliest whales are known from India and Pakistan from around 52.5 million years ago, during the early Eocene. How long did it take for this land mammal to morph into the whales and...

10. link.springer.com › chapter › 10Return to the Sea: The Evolution of Marine Mammals

    link.springer.com › chapter › 10

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    Nov 15, 2019 · Early Cetacea are classified as Archaeoceti (six families), and their fossils reveal the morphological and functional evolution of early, terrestrial Artiodactyla to fully aquatic Cetacea over 15 million years during the Eocene (~52 Mya). The evolution of modern...