原鱷龍屬(學名:Proterochampsa)是主龍形下綱原鱷龍科的一屬,生存於三疊紀晚期的阿根廷與巴西。原鱷龍的身長可達1.8到2公尺。P. barrionuevoi的頭顱骨長44公分,身長可能達3.5公尺[1]。
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