Trimerus vs Isotelus
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Trimerus
Trimerus is an extinct genus of homalonotid trilobites that lived from the Silurian into the Devonian. It is recognized by a broad, weakly trilobate body, a large head with an expanded anterior margin, and a pygidium that is typically triangular; some species exceeded 20 centimeters in length. Fossils are known from North America, Europe, Australia, and other former marine settings, and the genus...
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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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