Bumastus vs Trimerus
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Bumastus
Bumastus is an extinct genus of Silurian trilobites in the family Illaenidae. Its inflated, smooth exoskeleton has weakly expressed segmentation, producing a rounded profile that distinguishes it from more strongly furrowed trilobites. Species are known from marine rocks in North America and Europe, including reef-associated Silurian deposits. The genus is useful for recognizing illaenid form and...
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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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