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Human Middle Ear Evolved From Fish Gills

Discussion in 'Science and Technology' started by sun rise, Jun 21, 2022 at 3:28 PM.

  1. sun rise

    sun rise "This is the Hour of God"
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    419-Million-Year-Old Chinese Fossil Shows Human Middle Ear Evolved From Fish Gills

    “Many important structures of human beings can be traced back to our fish ancestors, such as our teeth, jaws, middle ears, etc. The main task of paleontologists is to find the important missing links in the evolutionary chain from fish to humans. Shuyu has been regarded as a key missing link as important as Archaeopteryx, Ichthyostega and Tiktaalik,”
    ...
    The spiracle is a small hole behind each eye that opens to the mouth in some fishes. In sharks and all rays, the spiracle is responsible for the intake of water into the buccal space before being expelled from the gills. The spiracle is often located towards the top of the animal allowing breathing even while the animal is mostly buried under sediment.

    In the Polypterus, the most primitive, living bony fish, the spiracles are used to breathe air. However, fish spiracles were eventually replaced in most non-fish species as they evolved to breathe through their noses and mouths. In early tetrapods
    Tetrapods are four-limbed (with a few exceptions, such as snakes) vertebrates constituting the superclass Tetrapoda that includes living and extinct amphibians, reptiles, mammals, and birds. They evolved from a group of animals known as the Tetrapodomorpha which, in turn, evolved from ancient lobe-finned fishes (Sarcopterygii) around 390 million years ago in the middle Devonian period.
    " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">tetrapods, the spiracle seems to have developed first into the Otic notch. Like the spiracle, it was used in respiration and was incapable of sensing sound. Later the spiracle evolved into the ear of modern tetrapods, eventually becoming the hearing canal used for transmitting sound to the brain via tiny inner ear bones. This function has remained throughout the evolution to humans.

    “Our finding bridges the entire history of the spiracular slit, bringing together recent discoveries from the gill pouches of fossil jawless vertebrates, via the spiracles of the earliest jawed vertebrates, to the middle ears of the first tetrapods, which tells this extraordinary evolutionary story,” said Prof. Per E. Ahlberg from Uppsala University and academician of the Royal Swedish Academy of Sciences.

    Reference: “The Evolution of the Spiracular Region From Jawless Fishes to Tetrapods” by Zhikun Gai, Min Zhu, Per E. Ahlberg and Philip C. J. Donoghue, 19 May 2022, Frontiers in Ecology and Evolution.
    DOI: 10.3389/fevo.2022.887172
     
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  2. Polymath257

    Polymath257 Think & Care
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    More specifically, fish gills evolved into the jaws of jawed fish, which evolved into reptile jaw which evolved into the mammalian inner ear.

    It is nice to find an example of a complete spiracle.
     
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  3. Secret Chief

    Secret Chief Northern scum

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    See! Scientists used to say we were "evolved" from monkeys, now they say fish! Bloody leftists.
     
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