Michel Laurin與Robert Reisz在1995年提出一個不同的分類法,爬蟲綱被分成副爬蟲類(現為正式的分類)與真爬行動物。大鼻龍科被改成真爬行動物,副爬蟲類包括早期無孔亞綱與龜鱉目,但不包含大鼻龍科與Protorothyrididae科。中龍科被列在兩群之外,成為爬蟲綱(但依舊是蜥形綱)的姐妹分類。傳統的無孔亞綱被否決成並系群。如下列:
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