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广泛分布于古生代寒武纪(6亿年前)海洋中,属甲壳类动物。古生代前期,以水生无脊椎动物和藻类最繁盛,
It is widely distributed in the Paleozoic Cambrian (600 million years ago) in the ocean and is a crustacean. In the early Paleozoic era, aquatic invertebrates and algae were the most prosperous.