De novo mutations in captivity

[Serpent_Nirvana]

in 1997.
To my knowledge though no codominant/dominant ball python morphs have ever originated in captivity. Sure at some point they all started some how.

Reading Corey Woods' story on the "Mutation X," it sounded to me as though it was a true de novo. I could be misreading it, though, and maybe the founder animal is also a "Mutation X," just not easily identified as such.