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  2. Archaeoceti - Wikipedia

    en.wikipedia.org/wiki/Archaeoceti

    Archaeoceti ("ancient whales"), or Zeuglodontes in older literature, is a paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene 1] Representing the earliest cetacean radiation , they include the initial amphibious stages in cetacean evolution , thus are the ancestors of both modern cetacean suborders ...

  3. Evolution of cetaceans - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_cetaceans

    Genera from the Oligocene and Miocene had teeth in their upper jaws. These anatomical differences suggest that these ancient species may not have necessarily been deep-sea squid hunters like the modern sperm whale, but that some genera mainly ate fish. [27] [58] Contrary to modern sperm whales, most ancient sperm whales were built to hunt whales.

  4. Basilosauridae - Wikipedia

    en.wikipedia.org/wiki/Basilosauridae

    As archaeocetes, Basilosaurids lacked the telescoping skull of present whales. Their jaws were powerful, [9] with a dentition easily distinguishable from that of other archaeocetes: they lack upper third molars and the upper molars lack protocones, trigon basins, and lingual third roots. The cheek teeth have well-developed accessory denticles.

  5. Squalodon - Wikipedia

    en.wikipedia.org/wiki/Squalodon

    These whales are characterized by both ancestral and modern features. Their teeth are the most evident ancestral feature. At this time in history other toothed whales were evolving simple conical teeth while Squalodontidae retained their primitive dentition that their ancestors (the archaeocetes) had developed. [5]

  6. Livyatan - Wikipedia

    en.wikipedia.org/wiki/Livyatan

    Since the teeth of foetal modern sperm whales (Physeter macrocephalus) have enamel on them before being coated with cementum, it is thought that the enamel is also an ancient characteristic . The appearance of raptorial sperm whales in the fossil record coincides with the diversification of baleen whales in the Miocene , implying that they ...

  7. Teeth embedded in cave walls reveal new species of ancient ...

    www.aol.com/teeth-embedded-cave-walls-reveal...

    Researchers crawled in the dark on hands and knees to find the creature’s teeth, officials said. Teeth embedded in cave walls reveal new species of ancient sea creature in Kentucky Skip to main ...

  8. Zygorhiza - Wikipedia

    en.wikipedia.org/wiki/Zygorhiza

    Outside the upper one-rooted teeth and inside the upper two-rooted teeth there are pits for reception of the lower teeth. [14] Zygorhiza (and Dorudon) replaced their upper and lower deciduous first premolars with permanent teeth. This is very unusual in modern mammals and contrasts to extant toothed whales that only develop a single set of teeth.

  9. A powerful megalodon thrashed an ancient whale ... - AOL

    www.aol.com/news/powerful-megalodon-thrashed...

    In the seas millions of years ago, whales were regularly hunted.Megalodons, bus-sized sharks, are believed to have been dominant ocean predators some 20 to 3.6 million years ago. The now extinct ...