山東
小知識
紫羅蘭瓷蟹Petrolisthes violaceus，又稱紫羅蘭陸寄居蟹，軟甲綱十足目鎧甲蝦總科瓷蟹科巖瓷蟹屬的物種，分布于東南太平洋沿岸。成體殼寬約2.5厘米，殼薄，呈藍紫色。觸角較長。有三對步足和一對螯足。遇到危險時會斷肢逃生。
紫羅蘭瓷蟹Petrolisthes violaceus/ J. Antonio Baeza，CC BY 4.0，Unaltered
封面圖：紫羅蘭瓷蟹Petrolisthes violaceus/ Erasmo Macaya Horta，iNaturalist，CC BY 4.0
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