后口动物
后口动物总门（学名：拉丁语：Deuterostomia）是动物中个一个总门，拉真后生动物亚界个两侧对称动物分支中，搭原口动物相对。后口动物搭原口动物可以由胚胎发育相区分；拉后口动物中，第一个开口（胚孔）变成了肛门，而拉原口动物中则变成了嘴巴。
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