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  1. Beginning with the dawn of the Cambrian Period (542 million to 488 million years ago), echinoderms have a rich fossil history and are well represented by many bizarre groups, most of which are now extinct.
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  3. Origin and Early Evolution of Echinoderms | Annual Reviews

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  5. Echinoderm | Definition, Characteristics, Species, & Facts | Britannica

  6. Paleogenomics of Echinoderms | Science - AAAS

    2006年11月10日 · Evolutionary history of the major echinoderm groups. Deuterostomia consists of three major groups: the chordates, hemichordates, and echinoderms, all with fossil representatives in the Cambrian. Cambrian …

  7. Echinoderms - Smithsonian Ocean

  8. Deciphering the early evolution of echinoderms with …

    2015年3月5日 · Echinoderms are one of the most successful groups of marine invertebrates ever, with around 10 000 extant species belonging to five classes (asteroids, crinoids, echinoids, holothurians and ophiuroids), as well as a rich …

  9. The active evolutionary lives of echinoderm larvae | Heredity

  10. Echinoderm roots - Nature

  11. Evolution: Mapping Out Early Echinoderms - Cell Press

    2020年7月6日 · Bradley Deline and colleagues probe the origins of the echinoderms with a morphometric study of their early fossil record that dates back to approximately 520 million years ago, right in the furnace of the …

  12. Echinoderm - Evolution, Adaptations, Paleontology

    2024年9月30日 · While the fossil record of echinoderms is extensive, there are many gaps, and many questions remain concerning the early evolution of the group. Ancient echinoderms exhibited an extraordinary variety of bizarre …