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Biceratopsidae : ウィキペディア英語版 | Biceratopsidae
The Biceratopsidae is an extinct family of trilobites, fossil marine arthropods, with species of small to average size. Species of belonging to this family lived during the Toyonian stage (''Olenellus''-zone), 522–513 million years ago, in the former continent of Laurentia, including what are today the south-western United States and Canada. It contains the subfamilies Biceratopsinae and Bristoliinae.
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