For the longest time I never really “got” fins on dragons or that thing where dragons have a million bones in their wings but then today I saw an illustration for D&D Pathfinder where a dragon was drawn with these funky wings that were membranous but scalloped (?) with a bunch of little bones going through them like the rachis running down flight feathers and honestly
By total accident it made me think because the only place I’d seen that many bones in a limb was in fish (particularly ray-finned fish aka Actinopterygians)
Maybe fin dragons would be the closest related tetrapods to ray-finned fish.