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  • Trilobite | Cambrian period, Extinction, Arthropod, Facts | Britannica
    Trilobites, exclusively marine animals, first appeared at 521 million years ago near the beginning of the Cambrian Period (538 8 million to 485 4 million years ago), when they dominated the seas
  • Trilobite - Wikipedia
    Trilobites were already diverse and globally dispersed shortly after their origination, with trilobites reaching an apex of diversity during the late Cambrian– Ordovician, and remained diverse during the following Silurian and early Devonian
  • Trilobite evolutionary rates constrain the duration of the Cambrian . . .
    We show that trilobites have a Cambrian origin, as supported by the trace fossil record and molecular clocks Surprisingly, they exhibit constant evolutionary rates across the entire Cambrian, for all aspects of the preserved phenotype: discrete, meristic, and continuous morphological traits
  • Trilobite evolutionary rates constrain the duration of the Cambrian . . .
    We show that trilobites have a Cambrian origin, as supported by the trace fossil record and molecular clocks Surprisingly, they exhibit constant evolutionary rates across the entire Cambrian, for all aspects of the preserved phenotype: discrete, meristic, and continuous morphological traits
  • Trilobites - British Geological Survey
    Trilobites are particularly important for correlating Cambrian rocks Paradoxides, for example, occurs in rocks in England, Wales, Newfoundland, Sweden, Spain and Siberia, and shows that these rocks are all of the same, middle Cambrian age
  • What were trilobites? - Oxford University Museum of Natural History
    What were trilobites? Trilobites are a group of extinct marine arthropods that first appeared around 521 million years ago, shortly after the beginning of the Cambrian period, living through the majority of the Palaeozoic Era, for nearly 300 million years
  • Trilobite Website | AMNH
    They initially emerged in the Lower Cambrian, some 521 million years ago, and survived until the end of the Permian, 270 million years later They had calcite-covered bodies that were divided into three parts: a head (or cephalon), a midsection (or thorax), and a tail (or pygidium)
  • How trilobites conquered prehistoric oceans - Natural History Museum
    Trilobites appeared in the Cambrian Period, which lasted from 538 million to 485 million years ago At the beginning of the Cambrian Period, the rate of evolution was exceptionally high
  • Trilobites, Earths Fascinating Prehistoric Arthropods - Geology Science
    Trilobites were a diverse group of extinct marine arthropods that lived from the Cambrian to the Permian periods They had a hard exoskeleton divided into three lobes, hence the name “trilobite ”
  • Trilobites - ScienceDirect
    Trilobites are a group of marine arthropods, of the class Trilobita, which appeared in the earliest part of Epoch 2 (a provisional name for this time interval) of the Cambrian Period, some 521 million years ago





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