腕足類動物與化石![](https://pic.pimg.tw/folkmit/1653697751-1366085499-g_n.jpg)
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腕足動物不是貝類。腕足動物是海生底棲、單體、群居、具體腔、不分節而兩側對襯之無脊椎動物。體外被著兩辮大小不等的殼,殼質為鈣質或幾丁磷灰質。
腕足動物生存的歷史相當悠久,從古生代寒武紀到新生代第四紀,都有牠們的蹤跡。
常見的顎頭貝、歐姆貝、象州貝、石燕等化石,都屬腕足類,因量多,價格很親民,但欲蒐羅多種卻不易。而石燕與龍骨、龍齒、石蟹等,則是很有名的中藥藥材。
台灣真是寶島,竟然也有腕足類動物化石之出露,計有:恆春的頭溝和四溝、小琉球、鳳鼻頭、大岡山、關子嶺等地。現生腕足類則有生活於南台灣海域的海豆芽。(圖/文李天德提供)
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