fresh water crustacean
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小型淡水甲壳动物，长有盾牌状甲壳。
Small freshwater crustaceans with a shield-shaped carapace.
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这是唯一的本地小龙虾种，而淡水甲壳动物是生态系统的另一部分。
It's the only native crayfish species, and the freshwater crustaceans are are just another part of the ecosystem.
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