Hermit crabs are decapod crustaceans of the superfamily Paguroidea.[1] They are not closely related to true crabs. Most species of hermit crabs have long soft abdomens which are protected from predators by the adaptation of carrying around a salvaged empty seashell, into which the whole crab's body can retract. Most frequently hermit crabs utilize the shells of sea snails, marine gastropod mollusks. The tip of the hermit crab's abdomen is adapted to clasp strongly onto the columella of the snail shell. As the hermit crab grows in size it has to find a larger shell and abandon the previous one. ~**~**~**~**~**~**~**~**~**~**~**~**~**~**~** 寄居蟹屬於節肢動物甲壳纲十足目下的歪尾下目,而我们常说的螃蟹属于十足目下的短尾下目。 寄居蟹常寄居于死亡甲壳动物的壳中,以保护其柔软的腹部,故名。世界上现存500多种寄居蟹,绝大部分生活在水中,也有少数生活在陆地。更有一些寄居蟹不再寄居在甲壳里,而是发展出了类似螃蟹的硬壳,也叫硬壳寄居蟹,著名的阿拉斯加帝王蟹就是一种。 2008年的我,二十二岁。2008年的祖国,五十一岁。2008年“寄居论”的论者,不知今年贵庚。不过他的历史好像没读好,又或是他的记忆因年龄的问题开始退化了。五十一年前,祖先们还在为如何从英国殖民统治下解脱而伤脑筋时,大家不分种族,不分阶级地拟好方案,为独立的那历史性的一刻而努力着。独立后,没有任何先驱,为了抢功,而伤害彼此,发表类似是谁最先发现了这块资源丰厚的新大...
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