YOU: For instance, paleontological evidence shows that legs developed among fully aquatic animals to facilitate movement in plant-filled shallow water. It is quite easy to postulate a gradual move by animals from sea to land and voila! The fossil record pretty much backs this up.
ME: Give me examples of how the fossil record backs this up. In other words, showing the progression from the species which could live only in water and had no legs or lungs, to the one which had the legs and lungs but was still primarily aquatic, to the one which lived out of water entirely.
I'm asking for three different species in the fossil records. All you're giving me is something which lived in the water and had some kind of legs and lungs. Actually, what I should have asked for is four different species, with the second one being the aquatic creature which had legs and lungs, which is what you gave me.
Also, I don't understand how getting lungs for an entirely aquatic species conferred a survival advantage, which is what drives evolution, but that's another issue.