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.