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標題: 世界上最大的節肢動物 (27P) [列印本頁]

作者: 第五次元 時間: 2016-12-7 15:02:15 標題: 世界上最大的節肢動物 (27P)

本帖最後由第五次元於 2016-12-7 15:05 編輯

　　中文名稱：椰子蟹

　　拉丁學文：Birgus latro (Linnaeus, 1766)

　　英文名稱：coconut crab

　　別名：強盜蟹（robber crab）、八卦蟹、山霸

　　這種蟹廣泛分佈於太平洋和印度洋的熱帶地區。據記載，其中在印度洋的聖誕島以及馬來群島、印度尼西亞、菲律賓、澳洲以及我國南海和台灣省都有分佈。

　　體很大，頭胸甲長度可達16厘米以上。體軀和附肢甲殼鈣化，堅厚，頭胸甲及步足表面有波狀皺紋。頭胸甲的鰓區特別擴大。額角呈三角形，眼鱗小。左螯大於右螯。腹部的背甲與側甲皆鈣化，部分彎折在頭胸甲之下。僅一側保留著已退化的腹肢。

　　除了捕食用的螯足看起來一大一小以外，身體兩側是對稱的，這樣大而結實的個體，常常被誤認為是螃蟹，但它可是貨真價實的寄居蟹一族。因為不用寄住在束縛身體生長的螺殼裡面，成年蟹的外型都會比較可觀，在國外最大曾有體重重達七公斤以上，體長近半公尺的紀錄，可說是陸地上最大型的節肢動物。
組圖：真實生活中的異形怪蟹

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