Bristolia vs Isotelus
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Bristolia
Bristolia is an extinct genus of olenellid trilobites from the Early Cambrian of western North America. It is particularly associated with fossil-bearing strata in Nevada and California and is recognized by the long genal spines extending from the sides of its cephalon. The genus is used in work on early trilobite evolution and the regional biostratigraphy of Cambrian rocks.
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Isotelus
Isotelus is an extinct genus of large asaphid trilobite that lived during the Ordovician period. It possessed a smooth, relatively featureless exoskeleton and lacked the prominent spines seen in other trilobite genera. The species Isotelus rex, discovered in Manitoba, Canada, is recognized as one of the largest trilobites in the fossil record. The genus is well-known for its prevalence in ancient...
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