As far as I know, there is no such thing as a "line" of harlequins.

In general, the term "harlequin" is given to a wild type ball python that has unbroken dorsal striping.

No matter what the name, those babies look incredible, I can't wait to see how they develop. Keep us posted on this project!

(if something new genetically does prove out, I'd suggest calling it something other than "harlequin")