Yes, there were other reptilia that are confused with the dinosaurian order (sea and air) but the dinosaurs are, at least in some places classed as reptilia.
I can see your argument about warm-bloodedness and such and that may well separate them out at sometime but that change hasn't been made yet.
However, they are NOT closely related to snakes other than that. They are more closely related to birds. I wonder why the bible did't tell Buz that they were cursed into being birds.