Ananaspis vs Trimerus
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Ananaspis
Ananaspis is an extinct genus of phacopid trilobites in the family Phacopidae, established by Campbell in 1967. It is known from Silurian marine strata, including the Henryhouse Formation of Oklahoma, Upper Silurian deposits in the East Baltic, and Silurian rocks of central Victoria in Australia. The genus is placed in the order Phacopida and has been discussed in studies of phacopid evolution 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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