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  1. Evolution of Sharks的图片

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  2. Wikipedia
    https://en.wikipedia.org/wiki/Shark

    Shark - Wikipedia

    1 天前 · Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade …

    标记:
    Great White Sharks
    Modern Sharks
    Elasmobranch fish
    Cartilaginous skeleton
  3. Britannica
    https://www.britannica.com/animal/fish/...

    Chondrichthyes : sharks and rays - Encyclopedia …

    3 天之前 · The primary evolution and diversification of modern sharks, skates, and rays took place in the Cretaceous Period and Cenozoic Era. Thus, along with the teleost fishes (discussed below), most surviving sharks, skates, and rays …

  5. Britannica
    https://www.britannica.com/animal/shark

    Shark | Attacks, Types, & Facts | Britannica

    标记:
    Great White Sharks
    Encyclopaedia Britannica
    Modern Sharks
  6. britannica.com
    https://www.britannica.com/animal/chondrichthian/...

    Evolution and classification - Encyclopedia Britannica

  7. Britannica
    https://www.britannica.com/animal/me…

    Megalodon | Size, Fossil, Teeth, & Facts | Britannica

    2024年10月30日 · megalodon, (Carcharocles megalodon), member of an extinct species of megatooth shark (Otodontidae) that is considered to be the largest shark, as well as the largest fish, that ever lived. Fossils attributed to …

    标记:
    Encyclopaedia Britannica
    Info On Megalodon
    Megalodon Facts
    Megalodon Size
  8. Forbes
    https://www.forbes.com/sites/melissacristina...

    Sharks In The Cretaceous: How Temperature Shaped Their …

    标记:
    Sharks
    Temperature
  9. 其他用户还问了以下问题
    When did Sharks first appear?
    They write new content and verify and edit content received from contributors. The earliest sharks (class Chondrichthyes) first appeared in the Early Devonian about 400 million years ago, became quite prominent by the end of the Devonian, and are still successful today.

    Fish - Sharks, Rays, Chondrichthyes | Britannica

    britannica.com
    How did Sharks evolve during the Cretaceous period?
    The Cretaceous period, specifically from the Barremian to the Cenomanian ages, marks critical phases in shark evolution. Phylogenetic analyses indicate that by the Barremian, selachians had begun to occupy open-water habitats. During this time, both the body size of sharks and the aspect ratio of their pectoral fins increased significantly.

    Sharks In The Cretaceous: How Temperature Shaped Their Evolution

    forbes.com
    Where did sharks come from?
    Modern sharks and rays arose during the Jurassic Period, about 200 million to 145.5 million years ago, probably from an older group, the hybodont sharks. Presumably marine cladoselachians gave rise to the hybodont Heterodontiformes during the close of the Devonian.

    Fish - Sharks, Rays, Chondrichthyes | Britannica

    britannica.com
    Why did Sharks evolve during the mid-Cretaceous period?
    The mid-Cretaceous period was a pivotal moment for shark evolution, driven by volatile climate conditions and exceptionally high SSTs, averaging around 23 degrees Celsius. Warmer sea surface temperatures during the mid-Cretaceous, particularly the Cenomanian-Turonian Thermal Maximum, likely influenced muscle-driven performance in sharks.

    Sharks In The Cretaceous: How Temperature Shaped Their Evolution

    forbes.com
    How long did sharks live?
    Their evolutionary tale spanning millions of years. And recent research gives scientists a further glimpse into their lifespans, indicating that selachians (the group that includes all sharks) originated in benthic or benthopelagic habitats before expanding into the pelagic zone around 122.6 million years ago.

    Sharks In The Cretaceous: How Temperature Shaped Their Evolution

    forbes.com
    When did sharks go extinct?
    Two Early Devonian orders of primitive sharklike fishes, the Cladoselachiformes and the Cladodontiformes, became extinct by the end of the Permian, about 251 million years ago, while the freshwater order Xenacanthiformes lasted until the end of the Triassic, about 200 million years ago.

    Fish - Sharks, Rays, Chondrichthyes | Britannica

    britannica.com
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  10. Wikipedia
    https://en.wikipedia.org/wiki/Megalodon

    Megalodon - Wikipedia

    2 天之前 · Another model of the evolution of this genus, also proposed by Casier in 1960, is that the direct ancestor of the Carcharocles is the shark Otodus obliquus, which lived from the Paleocene through the Miocene epochs, 60 to …

    标记:
    Sharks
    Baleen Whales
  11. wikipedia.org
    https://en.wikipedia.org/wiki/Tiger_shark

    Tiger shark - Wikipedia

  12. Wikipedia
    https://en.wikipedia.org/wiki/Timeline_of_fish_evolution

    Timeline of fish evolution - Wikipedia

    标记:
    Evolution of fish
    Timeline
  13. nature.com
    https://www.nature.com/articles/s41598-024-77084-4

    An exceptionally preserved fossil assemblage from the early