In 1822, a French naturalist by the name of Geoffrey Saint-Hilaire cut open a lobster and noticed that its arthropod anatomy was essentially a mirror image of our own, along what is called the dorsoventral axis.

1822年，一位名叫杰弗里·圣希拉尔的法国博物学家切开了一只龙虾，发现它的解剖结构基本上就如同我们自己身体结构的镜像，是沿着背房中轴线的。