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  2. Diphyodont - Wikipedia

    en.wikipedia.org/wiki/Diphyodont

    A diphyodont is any animal with two sets of teeth, initially the deciduous set and consecutively the permanent set. [1] [2] [3] Most mammals are diphyodonts—as to chew their food they need a strong, durable and complete set of teeth. Diphyodonts contrast with polyphyodonts, whose teeth are constantly replaced.

  3. Mammal tooth - Wikipedia

    en.wikipedia.org/wiki/Mammal_tooth

    Horse teeth can be used to estimate the animal's age. Between birth and five years, age can be closely estimated by observing the eruption pattern on milk teeth and then permanent teeth. By age five, all permanent teeth have usually erupted. The horse is then said to have a "full" mouth.

  4. Narwhal - Wikipedia

    en.wikipedia.org/wiki/Narwhal

    The narwhal has a single pair of small vestigial teeth that reside in open tooth sockets in the upper jaw. These teeth, which differ in form and composition, encircle the exposed tooth sockets laterally, posteriorly, and ventrally. [30] [41] Vestigial teeth in male narwhals are commonly shed in the palate. The varied morphology and anatomy of ...

  5. Regalecus russelii - Wikipedia

    en.wikipedia.org/wiki/Regalecus_russelii

    The majority of these fish have toothless jaws, but small vestigial teeth have been observed in some. [2] There are 113 to 122 vertebrae present in the spine. [ 2 ] The skeleton contains distinct areas of hyperostosis , or hyper-ossified bones, that are most prominent on the dorsal pterygiophores , but is also present on the cleithrum and along ...

  6. Human vestigiality - Wikipedia

    en.wikipedia.org/wiki/Human_vestigiality

    Arrows show the vestigial structure called Darwin's tubercle. In the context of human evolution, vestigiality involves those traits occurring in humans that have lost all or most of their original function through evolution. Although structures called vestigial often appear functionless, they may retain lesser functions or develop minor new ones.

  7. Vestigiality - Wikipedia

    en.wikipedia.org/wiki/Vestigiality

    Many examples of these are vestigial in other primates and related animals, whereas other examples are still highly developed. The human caecum is vestigial, as often is the case in omnivores , being reduced to a single chamber receiving the content of the ileum into the colon .

  8. List of artiodactyls - Wikipedia

    en.wikipedia.org/wiki/List_of_artiodactyls

    Various artiodactyls, representing all four suborders. Artiodactyla is an order of placental mammals composed of even-toed ungulates – hooved animals which bear weight equally on two of their five toes with the other toes either present, absent, vestigial, or pointing posteriorly – as well as their descendants, the aquatic cetaceans.

  9. Evidence of common descent - Wikipedia

    en.wikipedia.org/wiki/Evidence_of_common_descent

    Vestigial teeth in narwhal. [101] Rudimentary digits of Ateles geoffroyi, Colobus guereza, and Perodicticus potto. [102] Vestigial dental primordia in the embryonic tooth pattern in mice. [103] Reduced or absent vomeronasal organ in humans and Old World monkeys. [104] [105] Presence of non-functional sinus hair muscles in humans used in whisker ...

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