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      • The cetaceans have evolved to become the dominant group of marine mammals, with the highest levels of taxonomic and ecological diversity, as well as the widest geographic range. They evolved from a group of hoofed terrestrial ancestors within the order Artiodactyla more than 50 million years ago during the Eocene period.
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  2. Evolution of mammals - Wikipedia › wiki › Evolution_of_mammals

    5 days ago · 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; synapsids from this ...

  3. Baleen whale - Wikipedia › wiki › Baleen_whale

    1 day ago · Molecular phylogeny suggests Mysticeti split from Odontoceti (toothed whales) between 26 and 17 million years ago between the late Oligocene or middle Miocene, but the earliest Mysticeti fossils date to at least 34 million years ago.

  4. Jul 18, 2021 · The ancestral status of Mesonychidae was first proposed by Leigh Van Valen in 1966 on the basis of certain dental similarities between the mesonychid Dissacus navajovius (which is Dissacus carnifex of Cope) and some archaeocete specimens. His rather cautious statement of the claim is worth recalling:

  5. Marine life - Wikipedia › wiki › Marine_life

    3 days ago · Amphibians first appeared around 364 million years ago, followed by early amniotes and birds around 155 million years ago (both from " reptile "-like lineages), mammals around 129 million years ago, homininae around 10 million years ago and modern humans around 250,000 years ago.

  6. Megalodon - Wikipedia › wiki › Megalodon

    4 days ago · Megalodon ( Otodus megalodon ), meaning "big tooth", is an extinct species of mackerel shark that lived approximately 23 to 3.6 million years ago (mya), during the Early Miocene to the Pliocene. It was formerly thought to be a member of the family Lamnidae and a close relative of the great white shark ( Carcharodon carcharias ).

    • †O. megalodon
    • Otodus
  7. Killer whale - Wikipedia › wiki › Killer_whales

    3 days ago · The killer whale is one of 35 species in the oceanic dolphin family, which first appeared about 11 million years ago. The killer whale lineage probably branched off shortly thereafter.

  8. 10 Things We Still Don't Know About Our Oceans - › 10-things-we-still-dont-know

    Jul 20, 2021 · How Did Complex Life Evolve In The Deep Sea? For billions of years, life only existed as microscopic, single-celled organisms in the depths of the ocean. Then, around 570 million years ago, something happened and complex life suddenly exploded in numbers, existing in the deepest parts of the ocean for nearly 15 million years before some of us left for land.

  9. Jul 19, 2021 · The theme park was ordered to meet “water quality parameters” by May 17. In its appeal, Marineland said its marine mammals were all under veterinary care.

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