頭足綱
頭足綱（Cephalopoda），係軟體動物門嘅其中一個分支，擁有無脊椎動物之中最複雜發達嘅神經系統，被認為係最聰明嘅無脊椎動物。進化程度係軟體動物中最高。有鞘亞綱、鸚鵡螺亞綱同菊石亞綱（已滅絕）呢幾類動物。較出名嘅動物有鸚鵡螺、十腕總目嘅魷魚、墨魚，同八腕總目嘅章魚呢啲。
身體結構
睇埋
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