三叶虫 (trilobites) 在地球的海底里繁衍了几百万年,从化石的研究记录里显示,它们大约生活在5亿4000万年前的寒武纪初期。在当时的寒武纪生物爆发 (Cambrian explosion) 后,不同的生物开始繁衍。三叶虫逐渐灭亡的时间是介在3亿-2亿4000万年前,尤其是2亿4500万-2亿5100万年前,在二叠纪和三叠纪交界时期 (Permian-Triassic boundary)的灭绝事件后,三叶虫即消失在化石纪录里。它们类属于节肢动物 (arthopods), 但它们的物种是否更接近甲壳类 (crustations)、螯肢动物类 (cheliceramorpha) ,如马蹄蟹、海蝎子和蜘蛛纲的动物或海蜘蛛(pycnogonida) ,目前我们尚未有全面的了解。
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相关连结
1.The Trilobites website has great pages about trilobite life (Sam M. Gon III).
2. An Australian Museum Online site about the trilobites.
3. The Fossil Museum has interesting pages about trilobites.
4. The Peronopsis interstricta (or some other Agnostida?) trilobite fossils shown on this page were found near Delta, Utah close to the private U-Dig fossil quarry, a commercial outfit that gives people a chance to find trilobite fossils.
5. Many trilobite fans have created websites full of photographs of trilobite fossils. This is one of the better ones, by Mark Bourrie.
6. 中国科学院计算机网路资讯中心的三叶虫世界
7. 石尚矿物化石博物馆三叶虫