animal(s) going from to vertebrates.

A fishapod is a fish that nonetheless either does or potentially does have access to land. In particular, it is a lobe-finned fish that has achieved a substantial but not quite total amphibian morphology.

Fishapods thus were not creatures that could spend substantial amounts of time out of the water nor were they particular adept at walking, but nonetheless also were not completely tied to the water. Furthermore, their means of locomotion out of the water presumably was tetrapod-like.

Another way of putting this is that the fishapods were the closest lobe-finned fish to the tetrapods but which, nonetheless, were not quite tetrapods.