Michel Laurin与Robert Reisz在1995年提出一个不同的分类法,爬行纲被分成副爬行动物(现为正式的分类)与真爬行动物。大鼻龙科被改成真爬行动物,副爬行动物包括早期无孔亚纲与龟鳖目,但不包含大鼻龙科与Protorothyrididae科。中龙科被列在两群之外,成为爬行纲(但依旧是蜥形纲)的姐妹分类。传统的无孔亚纲被否决成并系群。如下列:
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