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Biceratopsinae : ウィキペディア英語版 | Biceratopsinae
The Biceratopsinae is an extinct subfamily of trilobites, fossil marine arthropods, with species of small to average size. Species belonging to this subfamily lived during the Toyonian stage (Upper ''Olenellus''-zone), 516-513 million years ago, in the former continent of Laurentia, including what are today the South-Western United States and Canada. == Etymology == The Biceratopsinae are named for the type species ''Biceratops nevadensis''.
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