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1. • Jurassic mammaliaform Castorocauda

     • One of the first known proto-mammals similar to modern placentals was aquatic, the Jurassic mammaliaform Castorocauda.
     en.wikipedia.org › wiki › Aquatic_mammal

     Aquatic mammal - Wikipedia

2. en.wikipedia.org › wiki › Aquatic_mammalAquatic mammal - Wikipedia

   en.wikipedia.org › wiki › Aquatic_mammal

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   One of the first known proto-mammals similar to modern placentals was aquatic, the Jurassic mammaliaform Castorocauda. It seems to have been adapted to water much like a beaver, with teeth different in many ways from all other docodonts , presumably due to a difference in diet.

3. People also ask

   Which mammals have become completely aquatic?

   • There are only two groups of mammals (that we know of) that have become completely aquatic. These are the Cetacea (whales, dolphins, and porpoises) and the Sirenia ( sea cows and dugongs).

   Ocean Giants | Going Aquatic: Cetacean Evolution | Nature | PBS

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

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   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. Abstract The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions.

   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 become an aquatic animal?

   • That means that the transition from terrestrial animals to fully aquatic animals took about 12 million years. The key adaptations are mostly those that still characterize whales today: forelimbs modified into flippers, extra vertebrae in their trunk and back, and flukes on their tails for locomotion.

   Ocean Giants | Going Aquatic: Cetacean Evolution | Nature | PBS

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

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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

   See all results for this question

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. www.nhm.ac.uk › discover › when-whales-walked-onWhen whales walked on four legs | Natural History Museum

   www.nhm.ac.uk › discover › when-whales-walked-on

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   Although whales are expert swimmers and perfectly adapted to life underwater, these marine mammals once walked on four legs. Their land-dwelling ancestors lived about 50 million years ago. Meet Pakicetus , a goat-sized, four-legged creature that scientists recognise as one of the first cetaceans (the group of marine animals that includes ...

6. 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...

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7. www.smithsonianmag.com › science-nature › the-firstAncient Whales Were the Biggest and Smallest of Their Kind to ...

   www.smithsonianmag.com › science-nature › the-first

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   Nov 7, 2023 · Named after Basilosaurus, one of the first fossil whales ever discovered, these oceanic carnivores were seagoing success stories. And a pair of recent fossil discoveries underscores how these...

   • Author: Riley Black

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

   anatomypubs.onlinelibrary.wiley.com › doi › full

   May 21, 2007 · 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.

9. www.intechopen.com › chapters › 40763When Whales Became Mammals: The Scientific Journey of ...

   www.intechopen.com › chapters › 40763

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   Nov 7, 2012 · The first researcher of the biology of marine mammals in this period was Johann Jonston b. 15 September 1603, Szamotuly, Poland; d. 8 June 1675, Legnica, Poland. Although born in Poland, Jonston’s father was Scottish and his mother German.