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Thread: A pre-Cambrian arthropod ancestor?

  1. #11
    tWebber TheLurch's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Source: NY Times

    Because Yilingia is made up of repeated, symmetrical segments, it is closer to the form that evolved into most life on earth, including human beings. Segmentation allowed for legs and wings.

    © Copyright Original Source


    Does this mean Yilingia didn't have legs? And it's referred to time and again as a worm, which would have a simpler nervous system than a legged creature.
    Sigh. As my original post said, it's right in the abstract:
    "Yilingia is possibly related to panarthropods or annelids, and sheds light on the origin of segmentation in bilaterians."

    And, in the body of the paper:
    "In this regard, the lateral lobes of Yilingia would be homol- ogous to appendages in arthropods or parapods in annelids, and provide an affirmation of other trackways of the terminal Ediacaran period that suggest the presence of bilaterians with paired locomotory appendages. This possibility is supported in Yilingia by putative podomeres in some lateral lobes."

    Podomeres are arthropod legs.

    Are you ever going to learn that your gut responses to things are invariably ill informed?
    "Any sufficiently advanced stupidity is indistinguishable from trolling."

  2. Amen HMS_Beagle, Seeker, shunyadragon amen'd this post.
  3. #12
    tWebber lee_merrill's Avatar
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    Quote Originally Posted by TheLurch View Post
    "This possibility is supported in Yilingia by putative podomeres in some lateral lobes."
    Well, "putative" indicates some doubtfulness.

    Quote Originally Posted by shunyadragon
    The present fossil knowledge indicates that it has a primitive nervous system, primitive head and capable locomotion and determining its motion, direction and feeding, and the head is different from the tail based on the fossil evidence.
    Not if calling it a worm is correct! And how does a fossil show its nervous system?

    Blessings,
    Lee
    "What I pray of you is, to keep your eye upon Him, for that is everything. Do you say, 'How am I to keep my eye on Him?' I reply, keep your eye off everything else, and you will soon see Him. All depends on the eye of faith being kept on Him. How simple it is!" (J.B. Stoney)

  4. #13
    tWebber TheLurch's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Well, "putative" indicates some doubtfulness.
    Did you read the initial post i made or not?
    "Any sufficiently advanced stupidity is indistinguishable from trolling."

  5. #14
    tWebber lee_merrill's Avatar
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    Quote Originally Posted by TheLurch View Post
    Did you read the initial post i made or not?
    Yes, I did, I also read the quote you gave from Nature. And I think "putative" indicates some doubt.

    Blessings,
    Lee
    "What I pray of you is, to keep your eye upon Him, for that is everything. Do you say, 'How am I to keep my eye on Him?' I reply, keep your eye off everything else, and you will soon see Him. All depends on the eye of faith being kept on Him. How simple it is!" (J.B. Stoney)

  6. #15
    tWebber TheLurch's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Yes, I did, I also read the quote you gave from Nature. And I think "putative" indicates some doubt.
    What part of this didn't already explain that?
    And there's a chance it's an annelid, like many present-day segmented worms. But the discoverers of this fossil see things that might be like insect legs on the segments. In which case this would have a subset of arthropod features, and therefore be a strong candidate for the sort of creature that would be an arthropod precursor.
    "Any sufficiently advanced stupidity is indistinguishable from trolling."

  7. #16
    tWebber shunyadragon's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Well, "putative" indicates some doubtfulness.


    Not if calling it a worm is correct! And how does a fossil show its nervous system?

    Blessings,
    Lee
    The animal crawls on the sea floor, and you have to have a nervous system to do that.
    Glendower: I can call spirits from the vasty deep.
    Hotspur: Why, so can I, or so can any man;
    But will they come when you do call for them? Shakespeare’s Henry IV, Part 1, Act III:

    go with the flow the river knows . . .

    Frank

    I do not know, therefore everything is in pencil.

  8. #17
    tWebber lee_merrill's Avatar
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    Quote Originally Posted by TheLurch View Post
    What part of this didn't already explain that?
    Well, you yourself said "might", which precludes certainty.

    Blessings,
    Lee
    "What I pray of you is, to keep your eye upon Him, for that is everything. Do you say, 'How am I to keep my eye on Him?' I reply, keep your eye off everything else, and you will soon see Him. All depends on the eye of faith being kept on Him. How simple it is!" (J.B. Stoney)

  9. #18
    tWebber TheLurch's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Well, you yourself said "might", which precludes certainty.
    It is uncertain. I said it was uncertain right from the start. What i'm wondering is why, given i did that, you're treating its uncertainty as a revelation.
    "Any sufficiently advanced stupidity is indistinguishable from trolling."

  10. #19
    tWebber shunyadragon's Avatar
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    Quote Originally Posted by lee_merrill View Post
    Well, you yourself said "might", which precludes certainty.

    Blessings,
    Lee
    Based on your 'arguing from ignorance' based on an agenda dishonestly misrepresenting The Lurch
    Glendower: I can call spirits from the vasty deep.
    Hotspur: Why, so can I, or so can any man;
    But will they come when you do call for them? Shakespeare’s Henry IV, Part 1, Act III:

    go with the flow the river knows . . .

    Frank

    I do not know, therefore everything is in pencil.

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