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Keyword: bilaterians

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  • A 550-million-year-old worm was one of the first animals to move and make decisions...

    09/05/2019 2:09:11 PM PDT · by BenLurkin · 50 replies
    CNN ^ | 09/05/2019 | Scottie Andrew,
    The team of scientists found the Yilingia spiciformis, which translates to "spiky Yiling bug," preserved in layers of rock near the Chinese city of Yiling. It resembled a millipede up to 10 inches in length, broken into 50 segments across its short body. The spiky Yiling bug is one of the earliest bilaterians—that is, animals with bilateral symmetry, like humans—with segmented bodies and movement. They laid the groundwork for larger animals to move, think and impact their environment, he said. Scientists always assumed segmented bilaterians evolved sometime between 635 million and 539 million years ago, but they'd never found evidence...
  • Fossil embryos deep in the fossil record (40 mya before Cambrian Explosion, yet still look "modern")

    02/06/2009 8:08:26 AM PST · by GodGunsGuts · 270 replies · 2,691+ views
    CMI ^ | Michael J. Oard
    ...The fossilized embryos shatter some ideas about evolution. Not only have certain cellular processes been pushed way back in time, but also there does not appear to be any evolution seen in these embryos, since many cellular processes, including some modern features, go clear back to the beginning of the fossil record. These embryos demonstrate that complex metazoans have been around since at least the Neoproterozoic and that from an evolutionary point of view their origins go back even further. Thus, the origin of animals is firmly based on nothing, and a huge evolutionary mystery: ‘The origin of animals is...