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紫罗兰瓷蟹Petrolisthes violaceus，又称紫罗兰陆寄居蟹，软甲纲十足目铠甲虾总科瓷蟹科岩瓷蟹属的物种，分布于东南太平洋沿岸。成体壳宽约2.5厘米，壳薄，呈蓝紫色。触角较长。有三对步足和一对螯足。遇到危险时会断肢逃生。
紫罗兰瓷蟹Petrolisthes violaceus/ J. Antonio Baeza，CC BY 4.0，Unaltered
封面图：紫罗兰瓷蟹Petrolisthes violaceus/ Erasmo Macaya Horta，iNaturalist，CC BY 4.0
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