蝾螈亚目(学名:Salamandroidea)为有尾目下个一个亚目,分布于除了南极洲、撒哈拉以南非洲与大洋洲以外的全世界。和隐鳃鲵亚目最大的差异在于,蝾螈亚目下颚的角骨与前关节骨愈合,且均为体内受精[2]。雌性个体透过雄性提供的精包授精,雌性会将精包储存于泄殖腔内的受精囊中直到产卵[3]。
目前最早已知的蝾螈亚目为发现于约157百万年前侏㑩纪晚期髫髻山组的建平北燕螈(Beiyanerpeton jianpingensis)[4]。
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