Can two different limbs... Merge?

I'm new to asking questions so please forgive me if i'm strange.

I have a species of plant-based dragons. Small, covered in feathers and intelligent. I just want one thing backed up for me because I haven't been able to find anything to back me up:

Can a wing and an arm merge together?

Dragons are naturally six-limbed, but the species I'm talking about has the skin and muscles of the arms merged into the wing. They walk on their knuckles, leaving the wings folded up. Is this feature able to be sensibly evolved?

Edit:

I realize I could've done better with explaining so I pulled out this old image.

Originally two separate limbs, bonded together by skin and muscle, but not bone.

posted about 5 years ago

RadioGoblin‭

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