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The tradeetional class Reptilia (green field) is a paraphyletic group comprisin aw amniotes (Amniota) ither nor the mammals an birds. In contrast, the clade Amniota itsel is monophyletic.

In taxonomy, a group is said tae be paraphyletic if it consists o aw the descendants o the group's last common ancestor minus a (smaa) nummer—teepically just ane or twa—o monophyletic subgroups.