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     • Most agree that Physeteridae (sperm whales) and Ziphiidae (beaked whales) are among the earliest of living groups to branch off within the odontocete clade after the split of Odontoceti and Mysticeti, which appears to have occurred at or perhaps just before the Eocene/Oligocene boundary (Fordyce, 2002).
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     Evolution of marine mammals: Back to the sea after 300 ...

2. People also ask

   How did marine mammals evolve?

   • The earliest representatives of each clade all show morphological features that indicate they were feeding while in the water, suggesting that feeding ecology is a key factor in the evolution of marine mammals.

   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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   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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   Are whales ancestors of land-living mammals?

   • All cetaceans, including whales, dolphins, and porpoises, are descendants of land-living mammals. How did these terrestrial ancestors morph over millions of years into the whales and dolphins we are so familiar with today? Dr. Mark Uhen talks with PBS Nature about marine mammal evolution. What do marine mammals have in common with other mammals?

   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...

   anatomypubs.onlinelibrary.wiley.com › doi › full

   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 · Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million years ago in the Eocene epoch. Even though all modern cetaceans are obligate aquatic mammals, early cetaceans were amphibious, and their ancestors were terrestrial artiodactyls, similar to small deer.

   • 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. anatomypubs.onlinelibrary.wiley.com › doi › absEvolution of marine mammals: Back to the sea after 300 ...

   anatomypubs.onlinelibrary.wiley.com › doi › abs

   May 21, 2007 · First published: 21 May 2007. https://doi.org/10.1002/ar.20545. Citations: 144. Read the full text. PDF. Tools. Share. Abstract. The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions. Five of these clades are still extant, whereas two are extinct.

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

    www.pbs.org › wnet › nature

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    Mar 21, 2012 · When did scientists first propose that marine mammals evolved from land-living mammals? What findings led to this conclusion?