Sometime, I may put into a story what my own Glinn Daro concludes about it...
I look forward to it
They identify themselves with reptiles, but they are an evolved form, so something quite close to therapsids, I would think. Evolution on Cardassia Prime took a little different course than on Earth, so I don't try to find an exact equivalent here on Earth for them. They are more than lizards, but their evolution doesn't exactly head toward mammalian lifeforms (although they share a lot of similar or the same features).
In a Cardassian library
or in a Cardassian gallery
"Reagan, it appears, is really only an ardent unionist if the unions in question are in Poland" - Stephen King, Skeleton Crew