I wasn't trying to present formal taxonomy, rather to give a list of the branchings showing where the groupings would be.
If I wanted better I would start with the Tree of Life project
Tree
of Life Web Project
The Reptilia includes the Anapsids (including turtles), and the Romeriida which includes the Diapsids. Under the diapsids we (eventually) come to the Sauria which includes Archosauormorpha under which are the Archosaurs (including crocodiles, birds and dinosaurs),
Also under Sauria are the Lepidosauromorpha including the Lepidosauria under which are the Squamata (lizards and snakes).
Amniota