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Inspired by Spinosaurus!...and quickly dissolved into being a more fully aquatic dragon.
Their wings are evolved into more fin-like structures (still developing a membrane of sorts) to push against water currents and balance themselves against confrontation with same/other species of their size. And the other smaller fins are just extension of their skeleton, cannot really move and only serve to form a more streamline purpose for the body.
Their other limbs are adapted for better mobility (they're probably at some point semi-aquatic and haven't gotten enough time to get rid of the arms and legs yet), they can reach into smaller spaces to snatch prey or just outright use their arms to capture prey given the chance—imagine some shelled creature, instead of risking damaging their own jaws if missed striking at the soft spots, they can just grab hold of the target first and feast. Additionally, they can use these yet somewhat agile claws to push past mazes of difficult rocky terrain in their habitat (fins would probably get injured more easily without extremely precise movements).
Other things: they are somewhat colorful to blend in with ancient corals in their habitat; when they swim, they use their fin-wings and (webbed) feet for paddling; they must surface to breathe; they are territorial and will fight each other (mostly male againat male) on water surface or underwater.