See also algae, arthropod, bacteria, chordate, invertebrate, protist, protozoan, vertebrate.
亦请参阅algae、arthropod、bacterium、chordate、invertebrate、protozoan、vertebrate。
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简史 In early fish-like vertebrates more than 500 million years ago; in a common ancestor of arthropods, such as insects, spiders, and crustaceans, at around the same time; and then in the cephalopod mollusks around 300 million years ago.
在 5 亿多年前的
期类鱼脊椎
中;节肢
的共同祖先,如昆虫、蜘蛛和甲壳类
,大约在同一时期;然后是 3 亿年前的头足类软体
。

简史